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Map material from china not allowed to leave the country
Unicorn Meta Zoo #1: Why another podcast?
Announcing the arrival of Valued Associate #679: Cesar Manara
April 2019 photo competition, “Road trip” (Read, rules are different.)Can I consign my pepper spray from Canada to China?Is there a usable online map site for China?In which places in China can travellers not stay at just any random local hotel?Getting from Tajikistan to ChinaNeed to leave for double entry china visa?Why does my phone's GPS not work in China?Calling from China to Home country (India) without internet accessChina visa 3rd country ruleCan you go to a country with other passport when home citizenship is not allowed in country?Can I leave China after entering with a 000 day Z Visa and not getting a residence permit?
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I just read an article about a company in germany which tests autonomous driving cars in different countries.
They state that they analyze all of the generated data in germany - with one exception: China.
"Because of legal regulations, no map material is allowed to leave the country."
Googling a few seconds for maps of china shows several results.
Can anyone explain this discrepancy?
legal china
asked 3 hours ago
TimSchTimSch
1233
New contributor
TimSch is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I just read an article about a company in germany which tests autonomous driving cars in different countries.
They state that they analyze all of the generated data in germany - with one exception: China.
"Because of legal regulations, no map material is allowed to leave the country."
Googling a few seconds for maps of china shows several results.
Can anyone explain this discrepancy?
legal china
asked 3 hours ago
TimSchTimSch
1233
New contributor
TimSch is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
youtube.com/watch?v=L9Di-UVC-_4
– Michael Hampton
2 hours ago
add a comment |
I just read an article about a company in germany which tests autonomous driving cars in different countries.
They state that they analyze all of the generated data in germany - with one exception: China.
"Because of legal regulations, no map material is allowed to leave the country."
Googling a few seconds for maps of china shows several results.
Can anyone explain this discrepancy?
legal china
asked 3 hours ago
TimSchTimSch
1233
New contributor
TimSch is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I just read an article about a company in germany which tests autonomous driving cars in different countries.
They state that they analyze all of the generated data in germany - with one exception: China.
"Because of legal regulations, no map material is allowed to leave the country."
Googling a few seconds for maps of china shows several results.
Can anyone explain this discrepancy?
legal china
legal china
asked 3 hours ago
TimSchTimSch
1233
New contributor
TimSch is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
TimSchTimSch
1233
New contributor
TimSch is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
TimSchTimSch
1233
New contributor
TimSch is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
TimSchTimSch
1233
asked 3 hours ago
TimSchTimSch
1233
1233
New contributor
TimSch is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
TimSch is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
TimSch is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
youtube.com/watch?v=L9Di-UVC-_4
– Michael Hampton
2 hours ago
add a comment |
1
youtube.com/watch?v=L9Di-UVC-_4
– Michael Hampton
2 hours ago
1
1
youtube.com/watch?v=L9Di-UVC-_4
– Michael Hampton
2 hours ago
youtube.com/watch?v=L9Di-UVC-_4
– Michael Hampton
2 hours ago
add a comment |
2 Answers
2
active
oldest
votes
I am not sure if the context of your question is really on-topic here, but since the answer and its implications is very much relevant for travellers as well, I'll give it a try.
The explanation you have read is not entirely accurate. The problem is that accurate map material is neither allowed to be published, nor to leave the country. The Chinese National Bureau of Surveying and Mapping require all companies to obtain permits for map surveying and published map data must be obfuscated, resulting in a deviation of up to 700m between the map and the real world. To quote a well-known German children tv show: Sounds strange, but that is how it is.
You can easily see the result of this obfuscation if you e.g. in Google Maps look at the satellite imagery with a map overlay. It is especially obvious in border proximity, where you will see that the map data for China is skewed, while the map outside China is correct. If you look at this area, the Shenzhen Bay with the border between China and Hong Kong, you can see that the map over Hong Kong in the lower right area is correct, while in the middle of the bay, the map seem to indicate that the bridge makes a sharp bend to the right, while you on the satellite image can see that the bridge in reality is straight. In the upper left area (mainland China), you can then see that there is a significant discrepancy between the imagery and the map. Roads seem to float on the water, pass through buildings and what else not.
answered 3 hours ago
Tor-Einar JarnbjoTor-Einar Jarnbjo
34.4k486125
Is there a known reason for this? Especially the need of obfuscation seems a bit strange. My only idea would be defense (if some country starts an invasion they will need towels because the street is actually the sea), but this sounds extremely naive.
– TimSch
3 hours ago
3
@TimSch The Chinese Surveying and Mapping Law does not explain why the restriction is in place. It is commonly quoted that it is for national security purposes, but I am not really sure if there is any official statement on that subject at all. Similar regulations and restrictions are actually quite common in many other countries as well, but usually do not apply to the entire country, just to 'places of interest'.
– Tor-Einar Jarnbjo
3 hours ago
1
Does china mandate how exactly the skewing will be done? Do they do it themselves or is it the companies' responsibility? Can I get a bunch of maps of china and take an average?
– OganM
33 mins ago
@OganM The obfuscation algorithm is prespecified, not publicly known, but obviously deterministic. Since a lot of example data is available, there have been attempts to reverse-engineer the algorithm and there are relatively reliable software libraries available allowing a backwards mapping from obfuscated to real coordinates. You can find more information and links to further resources on Wikipedia: en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China
– Tor-Einar Jarnbjo
13 mins ago
add a comment |
China has some pretty strict laws (for national security purposes, it seems) related to mapping and geographical surveying, effectively outlawing it for non-nationals.
See OpenStreetMap's view of the topic.
answered 3 hours ago
RichardRichard
1,713517
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
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oldest
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active
oldest
votes
I am not sure if the context of your question is really on-topic here, but since the answer and its implications is very much relevant for travellers as well, I'll give it a try.
The explanation you have read is not entirely accurate. The problem is that accurate map material is neither allowed to be published, nor to leave the country. The Chinese National Bureau of Surveying and Mapping require all companies to obtain permits for map surveying and published map data must be obfuscated, resulting in a deviation of up to 700m between the map and the real world. To quote a well-known German children tv show: Sounds strange, but that is how it is.
You can easily see the result of this obfuscation if you e.g. in Google Maps look at the satellite imagery with a map overlay. It is especially obvious in border proximity, where you will see that the map data for China is skewed, while the map outside China is correct. If you look at this area, the Shenzhen Bay with the border between China and Hong Kong, you can see that the map over Hong Kong in the lower right area is correct, while in the middle of the bay, the map seem to indicate that the bridge makes a sharp bend to the right, while you on the satellite image can see that the bridge in reality is straight. In the upper left area (mainland China), you can then see that there is a significant discrepancy between the imagery and the map. Roads seem to float on the water, pass through buildings and what else not.
answered 3 hours ago
Tor-Einar JarnbjoTor-Einar Jarnbjo
34.4k486125
Is there a known reason for this? Especially the need of obfuscation seems a bit strange. My only idea would be defense (if some country starts an invasion they will need towels because the street is actually the sea), but this sounds extremely naive.
– TimSch
3 hours ago
3
@TimSch The Chinese Surveying and Mapping Law does not explain why the restriction is in place. It is commonly quoted that it is for national security purposes, but I am not really sure if there is any official statement on that subject at all. Similar regulations and restrictions are actually quite common in many other countries as well, but usually do not apply to the entire country, just to 'places of interest'.
– Tor-Einar Jarnbjo
3 hours ago
1
Does china mandate how exactly the skewing will be done? Do they do it themselves or is it the companies' responsibility? Can I get a bunch of maps of china and take an average?
– OganM
33 mins ago
@OganM The obfuscation algorithm is prespecified, not publicly known, but obviously deterministic. Since a lot of example data is available, there have been attempts to reverse-engineer the algorithm and there are relatively reliable software libraries available allowing a backwards mapping from obfuscated to real coordinates. You can find more information and links to further resources on Wikipedia: en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China
– Tor-Einar Jarnbjo
13 mins ago
add a comment |
I am not sure if the context of your question is really on-topic here, but since the answer and its implications is very much relevant for travellers as well, I'll give it a try.
The explanation you have read is not entirely accurate. The problem is that accurate map material is neither allowed to be published, nor to leave the country. The Chinese National Bureau of Surveying and Mapping require all companies to obtain permits for map surveying and published map data must be obfuscated, resulting in a deviation of up to 700m between the map and the real world. To quote a well-known German children tv show: Sounds strange, but that is how it is.
You can easily see the result of this obfuscation if you e.g. in Google Maps look at the satellite imagery with a map overlay. It is especially obvious in border proximity, where you will see that the map data for China is skewed, while the map outside China is correct. If you look at this area, the Shenzhen Bay with the border between China and Hong Kong, you can see that the map over Hong Kong in the lower right area is correct, while in the middle of the bay, the map seem to indicate that the bridge makes a sharp bend to the right, while you on the satellite image can see that the bridge in reality is straight. In the upper left area (mainland China), you can then see that there is a significant discrepancy between the imagery and the map. Roads seem to float on the water, pass through buildings and what else not.
answered 3 hours ago
Tor-Einar JarnbjoTor-Einar Jarnbjo
34.4k486125
Is there a known reason for this? Especially the need of obfuscation seems a bit strange. My only idea would be defense (if some country starts an invasion they will need towels because the street is actually the sea), but this sounds extremely naive.
– TimSch
3 hours ago
3
@TimSch The Chinese Surveying and Mapping Law does not explain why the restriction is in place. It is commonly quoted that it is for national security purposes, but I am not really sure if there is any official statement on that subject at all. Similar regulations and restrictions are actually quite common in many other countries as well, but usually do not apply to the entire country, just to 'places of interest'.
– Tor-Einar Jarnbjo
3 hours ago
1
Does china mandate how exactly the skewing will be done? Do they do it themselves or is it the companies' responsibility? Can I get a bunch of maps of china and take an average?
– OganM
33 mins ago
@OganM The obfuscation algorithm is prespecified, not publicly known, but obviously deterministic. Since a lot of example data is available, there have been attempts to reverse-engineer the algorithm and there are relatively reliable software libraries available allowing a backwards mapping from obfuscated to real coordinates. You can find more information and links to further resources on Wikipedia: en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China
– Tor-Einar Jarnbjo
13 mins ago
add a comment |
I am not sure if the context of your question is really on-topic here, but since the answer and its implications is very much relevant for travellers as well, I'll give it a try.
The explanation you have read is not entirely accurate. The problem is that accurate map material is neither allowed to be published, nor to leave the country. The Chinese National Bureau of Surveying and Mapping require all companies to obtain permits for map surveying and published map data must be obfuscated, resulting in a deviation of up to 700m between the map and the real world. To quote a well-known German children tv show: Sounds strange, but that is how it is.
You can easily see the result of this obfuscation if you e.g. in Google Maps look at the satellite imagery with a map overlay. It is especially obvious in border proximity, where you will see that the map data for China is skewed, while the map outside China is correct. If you look at this area, the Shenzhen Bay with the border between China and Hong Kong, you can see that the map over Hong Kong in the lower right area is correct, while in the middle of the bay, the map seem to indicate that the bridge makes a sharp bend to the right, while you on the satellite image can see that the bridge in reality is straight. In the upper left area (mainland China), you can then see that there is a significant discrepancy between the imagery and the map. Roads seem to float on the water, pass through buildings and what else not.
answered 3 hours ago
Tor-Einar JarnbjoTor-Einar Jarnbjo
34.4k486125
I am not sure if the context of your question is really on-topic here, but since the answer and its implications is very much relevant for travellers as well, I'll give it a try.
The explanation you have read is not entirely accurate. The problem is that accurate map material is neither allowed to be published, nor to leave the country. The Chinese National Bureau of Surveying and Mapping require all companies to obtain permits for map surveying and published map data must be obfuscated, resulting in a deviation of up to 700m between the map and the real world. To quote a well-known German children tv show: Sounds strange, but that is how it is.
You can easily see the result of this obfuscation if you e.g. in Google Maps look at the satellite imagery with a map overlay. It is especially obvious in border proximity, where you will see that the map data for China is skewed, while the map outside China is correct. If you look at this area, the Shenzhen Bay with the border between China and Hong Kong, you can see that the map over Hong Kong in the lower right area is correct, while in the middle of the bay, the map seem to indicate that the bridge makes a sharp bend to the right, while you on the satellite image can see that the bridge in reality is straight. In the upper left area (mainland China), you can then see that there is a significant discrepancy between the imagery and the map. Roads seem to float on the water, pass through buildings and what else not.
answered 3 hours ago
Tor-Einar JarnbjoTor-Einar Jarnbjo
34.4k486125
edited 3 hours ago
answered 3 hours ago
Tor-Einar JarnbjoTor-Einar Jarnbjo
34.4k486125
answered 3 hours ago
Tor-Einar JarnbjoTor-Einar Jarnbjo
34.4k486125
answered 3 hours ago
Tor-Einar JarnbjoTor-Einar Jarnbjo
34.4k486125
34.4k486125
Is there a known reason for this? Especially the need of obfuscation seems a bit strange. My only idea would be defense (if some country starts an invasion they will need towels because the street is actually the sea), but this sounds extremely naive.
– TimSch
3 hours ago
3
@TimSch The Chinese Surveying and Mapping Law does not explain why the restriction is in place. It is commonly quoted that it is for national security purposes, but I am not really sure if there is any official statement on that subject at all. Similar regulations and restrictions are actually quite common in many other countries as well, but usually do not apply to the entire country, just to 'places of interest'.
– Tor-Einar Jarnbjo
3 hours ago
1
Does china mandate how exactly the skewing will be done? Do they do it themselves or is it the companies' responsibility? Can I get a bunch of maps of china and take an average?
– OganM
33 mins ago
@OganM The obfuscation algorithm is prespecified, not publicly known, but obviously deterministic. Since a lot of example data is available, there have been attempts to reverse-engineer the algorithm and there are relatively reliable software libraries available allowing a backwards mapping from obfuscated to real coordinates. You can find more information and links to further resources on Wikipedia: en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China
– Tor-Einar Jarnbjo
13 mins ago
add a comment |
Is there a known reason for this? Especially the need of obfuscation seems a bit strange. My only idea would be defense (if some country starts an invasion they will need towels because the street is actually the sea), but this sounds extremely naive.
– TimSch
3 hours ago
3
@TimSch The Chinese Surveying and Mapping Law does not explain why the restriction is in place. It is commonly quoted that it is for national security purposes, but I am not really sure if there is any official statement on that subject at all. Similar regulations and restrictions are actually quite common in many other countries as well, but usually do not apply to the entire country, just to 'places of interest'.
– Tor-Einar Jarnbjo
3 hours ago
1
Does china mandate how exactly the skewing will be done? Do they do it themselves or is it the companies' responsibility? Can I get a bunch of maps of china and take an average?
– OganM
33 mins ago
@OganM The obfuscation algorithm is prespecified, not publicly known, but obviously deterministic. Since a lot of example data is available, there have been attempts to reverse-engineer the algorithm and there are relatively reliable software libraries available allowing a backwards mapping from obfuscated to real coordinates. You can find more information and links to further resources on Wikipedia: en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China
– Tor-Einar Jarnbjo
13 mins ago
Is there a known reason for this? Especially the need of obfuscation seems a bit strange. My only idea would be defense (if some country starts an invasion they will need towels because the street is actually the sea), but this sounds extremely naive.
– TimSch
3 hours ago
Is there a known reason for this? Especially the need of obfuscation seems a bit strange. My only idea would be defense (if some country starts an invasion they will need towels because the street is actually the sea), but this sounds extremely naive.
– TimSch
3 hours ago
3
3
@TimSch The Chinese Surveying and Mapping Law does not explain why the restriction is in place. It is commonly quoted that it is for national security purposes, but I am not really sure if there is any official statement on that subject at all. Similar regulations and restrictions are actually quite common in many other countries as well, but usually do not apply to the entire country, just to 'places of interest'.
– Tor-Einar Jarnbjo
3 hours ago
@TimSch The Chinese Surveying and Mapping Law does not explain why the restriction is in place. It is commonly quoted that it is for national security purposes, but I am not really sure if there is any official statement on that subject at all. Similar regulations and restrictions are actually quite common in many other countries as well, but usually do not apply to the entire country, just to 'places of interest'.
– Tor-Einar Jarnbjo
3 hours ago
1
1
Does china mandate how exactly the skewing will be done? Do they do it themselves or is it the companies' responsibility? Can I get a bunch of maps of china and take an average?
– OganM
33 mins ago
Does china mandate how exactly the skewing will be done? Do they do it themselves or is it the companies' responsibility? Can I get a bunch of maps of china and take an average?
– OganM
33 mins ago
@OganM The obfuscation algorithm is prespecified, not publicly known, but obviously deterministic. Since a lot of example data is available, there have been attempts to reverse-engineer the algorithm and there are relatively reliable software libraries available allowing a backwards mapping from obfuscated to real coordinates. You can find more information and links to further resources on Wikipedia: en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China
– Tor-Einar Jarnbjo
13 mins ago
@OganM The obfuscation algorithm is prespecified, not publicly known, but obviously deterministic. Since a lot of example data is available, there have been attempts to reverse-engineer the algorithm and there are relatively reliable software libraries available allowing a backwards mapping from obfuscated to real coordinates. You can find more information and links to further resources on Wikipedia: en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China
– Tor-Einar Jarnbjo
13 mins ago
add a comment |
China has some pretty strict laws (for national security purposes, it seems) related to mapping and geographical surveying, effectively outlawing it for non-nationals.
See OpenStreetMap's view of the topic.
answered 3 hours ago
RichardRichard
1,713517
add a comment |
China has some pretty strict laws (for national security purposes, it seems) related to mapping and geographical surveying, effectively outlawing it for non-nationals.
See OpenStreetMap's view of the topic.
answered 3 hours ago
RichardRichard
1,713517
add a comment |
China has some pretty strict laws (for national security purposes, it seems) related to mapping and geographical surveying, effectively outlawing it for non-nationals.
See OpenStreetMap's view of the topic.
answered 3 hours ago
RichardRichard
1,713517
China has some pretty strict laws (for national security purposes, it seems) related to mapping and geographical surveying, effectively outlawing it for non-nationals.
See OpenStreetMap's view of the topic.
answered 3 hours ago
RichardRichard
1,713517
answered 3 hours ago
RichardRichard
1,713517
answered 3 hours ago
RichardRichard
1,713517
answered 3 hours ago
RichardRichard
1,713517
1,713517
add a comment |
add a comment |
TimSch is a new contributor. Be nice, and check out our Code of Conduct.
TimSch is a new contributor. Be nice, and check out our Code of Conduct.
TimSch is a new contributor. Be nice, and check out our Code of Conduct.
TimSch is a new contributor. Be nice, and check out our Code of Conduct.
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1
youtube.com/watch?v=L9Di-UVC-_4
– Michael Hampton
2 hours ago