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1

I have a list of rasters, created by arcpy using ListRasters. Rasters are stored in a geodatabase. How can I subset only one raster of the raster list? The goal is to make a new list, but containing only one raster file.

Ultimate goal is to loop through list of rasters and calculate Area solar radiation for each one of them. But, but for learning/training purposes I wish to explore my parameters only on single raster for now. (I know I can read-in just single raster, but I thought that subsetting might be easy as well?)

I have thought that I can simply subset the element by the index value, but this seems not working in arcpy. Any advices? I think I am missing something very obvious...

import arcpy, os

# Set working environment
arcpy.env.workspace = os.path.join(inWD, "output/bufRastTwins.gdb")

# List all rasters with defined name wildcard: r_1, r_2, r_3.. to r_100
allRasters = arcpy.ListRasters("r_*")

# Select the first raster from the rasters list
myRasters = allRasters[0]
print myRasters

My attempt leads to loop through raster name, not throught the subsetted raster itself:

print myRaster:
r_1 # first element succesfully created

but for raster in myRasters:
 print raster # this is obviously wrong

r
_ 
1

arcpy raster list

share|improve this question

edited 7 hours ago

PolyGeo♦

54.9k1717 gold badges8686 silver badges258258 bronze badges

asked 8 hours ago

mayccamaycca

1,36411 gold badge1717 silver badges3838 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi @BERA, thank you for your comment. I am trying to calculate solar radiation afterwards, but for making a script I wanted to run it simply on one raster. I have completed my question to answer your comment.
  
  – maycca
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  arcpy.ListRasters is only returning a list containing "raster names in the workspace". Extracting the first element of this list is only giving you the first raster name within the specified workspace. With it you can do something like os.path.join(inWD, "output/bufRastTwins.gdb", allRasters[0] to hae the full path plus name of your raster and use this as your input for further analysis.
  
  – umbe1987
  8 hours ago
  

  
  
  
  

add a comment | 

1

I have a list of rasters, created by arcpy using ListRasters. Rasters are stored in a geodatabase. How can I subset only one raster of the raster list? The goal is to make a new list, but containing only one raster file.

Ultimate goal is to loop through list of rasters and calculate Area solar radiation for each one of them. But, but for learning/training purposes I wish to explore my parameters only on single raster for now. (I know I can read-in just single raster, but I thought that subsetting might be easy as well?)

I have thought that I can simply subset the element by the index value, but this seems not working in arcpy. Any advices? I think I am missing something very obvious...

import arcpy, os

# Set working environment
arcpy.env.workspace = os.path.join(inWD, "output/bufRastTwins.gdb")

# List all rasters with defined name wildcard: r_1, r_2, r_3.. to r_100
allRasters = arcpy.ListRasters("r_*")

# Select the first raster from the rasters list
myRasters = allRasters[0]
print myRasters

My attempt leads to loop through raster name, not throught the subsetted raster itself:

print myRaster:
r_1 # first element succesfully created

but for raster in myRasters:
 print raster # this is obviously wrong

r
_ 
1

arcpy raster list

share|improve this question

edited 7 hours ago

PolyGeo♦

54.9k1717 gold badges8686 silver badges258258 bronze badges

asked 8 hours ago

mayccamaycca

1,36411 gold badge1717 silver badges3838 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi @BERA, thank you for your comment. I am trying to calculate solar radiation afterwards, but for making a script I wanted to run it simply on one raster. I have completed my question to answer your comment.
  
  – maycca
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  arcpy.ListRasters is only returning a list containing "raster names in the workspace". Extracting the first element of this list is only giving you the first raster name within the specified workspace. With it you can do something like os.path.join(inWD, "output/bufRastTwins.gdb", allRasters[0] to hae the full path plus name of your raster and use this as your input for further analysis.
  
  – umbe1987
  8 hours ago
  

  
  
  
  

add a comment | 

I have a list of rasters, created by arcpy using ListRasters. Rasters are stored in a geodatabase. How can I subset only one raster of the raster list? The goal is to make a new list, but containing only one raster file.

Ultimate goal is to loop through list of rasters and calculate Area solar radiation for each one of them. But, but for learning/training purposes I wish to explore my parameters only on single raster for now. (I know I can read-in just single raster, but I thought that subsetting might be easy as well?)

I have thought that I can simply subset the element by the index value, but this seems not working in arcpy. Any advices? I think I am missing something very obvious...

import arcpy, os

# Set working environment
arcpy.env.workspace = os.path.join(inWD, "output/bufRastTwins.gdb")

# List all rasters with defined name wildcard: r_1, r_2, r_3.. to r_100
allRasters = arcpy.ListRasters("r_*")

# Select the first raster from the rasters list
myRasters = allRasters[0]
print myRasters

My attempt leads to loop through raster name, not throught the subsetted raster itself:

print myRaster:
r_1 # first element succesfully created

but for raster in myRasters:
 print raster # this is obviously wrong

r
_ 
1

arcpy raster list

share|improve this question

edited 7 hours ago

PolyGeo♦

54.9k1717 gold badges8686 silver badges258258 bronze badges

asked 8 hours ago

mayccamaycca

1,36411 gold badge1717 silver badges3838 bronze badges

import arcpy, os

# Set working environment
arcpy.env.workspace = os.path.join(inWD, "output/bufRastTwins.gdb")

# List all rasters with defined name wildcard: r_1, r_2, r_3.. to r_100
allRasters = arcpy.ListRasters("r_*")

# Select the first raster from the rasters list
myRasters = allRasters[0]
print myRasters

print myRaster:
r_1 # first element succesfully created

but for raster in myRasters:
 print raster # this is obviously wrong

r
_ 
1

share|improve this question

edited 7 hours ago

PolyGeo♦

54.9k1717 gold badges8686 silver badges258258 bronze badges

asked 8 hours ago

mayccamaycca

1,36411 gold badge1717 silver badges3838 bronze badges

share|improve this question

edited 7 hours ago

PolyGeo♦

54.9k1717 gold badges8686 silver badges258258 bronze badges

asked 8 hours ago

mayccamaycca

1,36411 gold badge1717 silver badges3838 bronze badges

edited 7 hours ago

PolyGeo♦

54.9k1717 gold badges8686 silver badges258258 bronze badges

edited 7 hours ago

PolyGeo♦

54.9k1717 gold badges8686 silver badges258258 bronze badges

asked 8 hours ago

mayccamaycca

1,36411 gold badge1717 silver badges3838 bronze badges

asked 8 hours ago

mayccamaycca

1,36411 gold badge1717 silver badges3838 bronze badges

1 Answer
1

active

oldest

votes

2

This myRasters = allRasters[0] will select first element of the list which is a string. So if you loop over it you loop over each characher in it which is what you see:

rasters = ['abc','def']

for raster in rasters[0]:
 print(raster)
a
b
c

You can slice the list like this which will return a list of only the first element:

for raster in myRasters[:1]:
 print(raster)
abc

share|improve this answer

edited 7 hours ago

answered 8 hours ago

BERABERA

20k66 gold badges2323 silver badges4646 bronze badges

add a comment | 

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2

This myRasters = allRasters[0] will select first element of the list which is a string. So if you loop over it you loop over each characher in it which is what you see:

rasters = ['abc','def']

for raster in rasters[0]:
 print(raster)
a
b
c

You can slice the list like this which will return a list of only the first element:

for raster in myRasters[:1]:
 print(raster)
abc

share|improve this answer

edited 7 hours ago

answered 8 hours ago

BERABERA

20k66 gold badges2323 silver badges4646 bronze badges

add a comment | 

2

This myRasters = allRasters[0] will select first element of the list which is a string. So if you loop over it you loop over each characher in it which is what you see:

rasters = ['abc','def']

for raster in rasters[0]:
 print(raster)
a
b
c

You can slice the list like this which will return a list of only the first element:

for raster in myRasters[:1]:
 print(raster)
abc

share|improve this answer

edited 7 hours ago

answered 8 hours ago

BERABERA

20k66 gold badges2323 silver badges4646 bronze badges

add a comment | 

This myRasters = allRasters[0] will select first element of the list which is a string. So if you loop over it you loop over each characher in it which is what you see:

rasters = ['abc','def']

for raster in rasters[0]:
 print(raster)
a
b
c

You can slice the list like this which will return a list of only the first element:

for raster in myRasters[:1]:
 print(raster)
abc

share|improve this answer

edited 7 hours ago

answered 8 hours ago

BERABERA

20k66 gold badges2323 silver badges4646 bronze badges

rasters = ['abc','def']

for raster in rasters[0]:
 print(raster)
a
b
c

for raster in myRasters[:1]:
 print(raster)
abc

share|improve this answer

edited 7 hours ago

answered 8 hours ago

BERABERA

20k66 gold badges2323 silver badges4646 bronze badges

answered 8 hours ago

BERABERA

20k66 gold badges2323 silver badges4646 bronze badges

answered 8 hours ago

BERABERA

20k66 gold badges2323 silver badges4646 bronze badges