Can Gdal.Translate() return an object instead of writing a file?Creating a multispectral image from...
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Can Gdal.Translate() return an object instead of writing a file?
Creating a multispectral image from scratchWriting numpy array to raster fileHow to apply “Band” settings using gdal Python bindings?Writing 3 channels to 8-bit TIF in Python using gdalHow does QGIS open so large raster datasets (about 40GB)?Setting band names when writing multiple layer rasters using GDAL with Python?How to draw a shapefile over GeoTIFF geometry to a PNGFind maximum of large (size) multiple rastersGDAL, python: How to create a GDAL dataset object from a numpy arrayStrange behavior when writing coordinates to an ESRI shapefile
I have some Python GDAL code I am using to convert a GeoTIFF file to PNG. The code uses the gdal.Translate() function which generates a new file each time I run it. However, I was wondering if there is a way to get the Python gdal.Translate() function to return a python object instead of writing a file? Ideally I would like to write to a numpy array or something, but any kind of internal object would be fine.
Here is some sample code I am using:
from osgeo import gdal
scale = '-scale min_val max_val'
options_list = [
'-ot Byte',
'-of JPEG',
scale
]
options_string = " ".join(options_list)
gdal.Translate('test.jpg',
'test.tif',
options=options_string)
I looked over the documentation and source code to figure out how gdal.Translate() worked, but could not get past the TranslateInternal() function. I could not find a link through the source code past that.
Any suggestions would be appreciated.
python gdal gdal-translate
asked 6 hours ago
krishnabkrishnab
248214
add a comment |
I have some Python GDAL code I am using to convert a GeoTIFF file to PNG. The code uses the gdal.Translate() function which generates a new file each time I run it. However, I was wondering if there is a way to get the Python gdal.Translate() function to return a python object instead of writing a file? Ideally I would like to write to a numpy array or something, but any kind of internal object would be fine.
Here is some sample code I am using:
from osgeo import gdal
scale = '-scale min_val max_val'
options_list = [
'-ot Byte',
'-of JPEG',
scale
]
options_string = " ".join(options_list)
gdal.Translate('test.jpg',
'test.tif',
options=options_string)
I looked over the documentation and source code to figure out how gdal.Translate() worked, but could not get past the TranslateInternal() function. I could not find a link through the source code past that.
Any suggestions would be appreciated.
python gdal gdal-translate
asked 6 hours ago
krishnabkrishnab
248214
There is a memory driver which may help gdal.org/frmt_mem.html I'm not sure how you could leverage the pointer in python but it works great in C++ (until you create a raster larger than your available memory). TranslateInternal() would be calling a C external link, you could find it in the source code if you understand ANSI C/C++. It might be best to write to a file in your os.environ.get('temp') then gdal.Open the temp raster.
– Michael Stimson
6 hours ago
add a comment |
I have some Python GDAL code I am using to convert a GeoTIFF file to PNG. The code uses the gdal.Translate() function which generates a new file each time I run it. However, I was wondering if there is a way to get the Python gdal.Translate() function to return a python object instead of writing a file? Ideally I would like to write to a numpy array or something, but any kind of internal object would be fine.
Here is some sample code I am using:
from osgeo import gdal
scale = '-scale min_val max_val'
options_list = [
'-ot Byte',
'-of JPEG',
scale
]
options_string = " ".join(options_list)
gdal.Translate('test.jpg',
'test.tif',
options=options_string)
I looked over the documentation and source code to figure out how gdal.Translate() worked, but could not get past the TranslateInternal() function. I could not find a link through the source code past that.
Any suggestions would be appreciated.
python gdal gdal-translate
asked 6 hours ago
krishnabkrishnab
248214
I have some Python GDAL code I am using to convert a GeoTIFF file to PNG. The code uses the gdal.Translate() function which generates a new file each time I run it. However, I was wondering if there is a way to get the Python gdal.Translate() function to return a python object instead of writing a file? Ideally I would like to write to a numpy array or something, but any kind of internal object would be fine.
Here is some sample code I am using:
from osgeo import gdal
scale = '-scale min_val max_val'
options_list = [
'-ot Byte',
'-of JPEG',
scale
]
options_string = " ".join(options_list)
gdal.Translate('test.jpg',
'test.tif',
options=options_string)
I looked over the documentation and source code to figure out how gdal.Translate() worked, but could not get past the TranslateInternal() function. I could not find a link through the source code past that.
Any suggestions would be appreciated.
python gdal gdal-translate
python gdal gdal-translate
asked 6 hours ago
krishnabkrishnab
248214
asked 6 hours ago
krishnabkrishnab
248214
asked 6 hours ago
krishnabkrishnab
248214
asked 6 hours ago
krishnabkrishnab
248214
asked 6 hours ago
krishnabkrishnab
248214
248214
There is a memory driver which may help gdal.org/frmt_mem.html I'm not sure how you could leverage the pointer in python but it works great in C++ (until you create a raster larger than your available memory). TranslateInternal() would be calling a C external link, you could find it in the source code if you understand ANSI C/C++. It might be best to write to a file in your os.environ.get('temp') then gdal.Open the temp raster.
– Michael Stimson
6 hours ago
add a comment |
There is a memory driver which may help gdal.org/frmt_mem.html I'm not sure how you could leverage the pointer in python but it works great in C++ (until you create a raster larger than your available memory). TranslateInternal() would be calling a C external link, you could find it in the source code if you understand ANSI C/C++. It might be best to write to a file in your os.environ.get('temp') then gdal.Open the temp raster.
– Michael Stimson
6 hours ago
There is a memory driver which may help gdal.org/frmt_mem.html I'm not sure how you could leverage the pointer in python but it works great in C++ (until you create a raster larger than your available memory). TranslateInternal() would be calling a C external link, you could find it in the source code if you understand ANSI C/C++. It might be best to write to a file in your os.environ.get('temp') then gdal.Open the temp raster.
– Michael Stimson
6 hours ago
There is a memory driver which may help gdal.org/frmt_mem.html I'm not sure how you could leverage the pointer in python but it works great in C++ (until you create a raster larger than your available memory). TranslateInternal() would be calling a C external link, you could find it in the source code if you understand ANSI C/C++. It might be best to write to a file in your os.environ.get('temp') then gdal.Open the temp raster.
– Michael Stimson
6 hours ago
add a comment |
1 Answer
1
active
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votes
gdal.Translate does return an object, it returns a gdal.Dataset object.
from osgeo import gdal
in_ds = gdal.OpenEx('path/to/input.tif')
print(in_ds)
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x00000000037BE930> >
out_ds = gdal.Translate('path/to/output.tif', in_ds)
print(out_ds )
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x00000000037BE990> >
It has to write the translated output somewhere...
If you don't want to write to disk, write to memory (don't bother with the MEM driver), use the "VSIMEM" virtual filesystem to write a GeoTIFF to memory:
out_ds = gdal.Translate('/vsimem/in_memory_output.tif', in_ds)
You can then read it into a numpy array if you want.
out_arr = out_ds.ReadAsArray()
answered 5 hours ago
user2856user2856
30.4k258106
Oh this is great. Yeah, I will give this a try. This will make stuff a lot easier. Just to anticipate my next question, can I convert aDatasetobject to a numpy array using theds.GetRasterBand(1).ReadAsArray()function? Is that what you were thinking or am I thinking in the wrong direction.
– krishnab
5 hours ago
Oh thank you so much. I was trying to figure this out since yesterday. Haha, like if I had energy left I would thank you more :). Yeah, so that will load all the bands into an array. I was trying to figure out if I needed to manually stack each band into an RGB array or shift from a raster ordering of the data to an image ordering, etc. But this totally answers my question.
– krishnab
5 hours ago
Yep, that is what I figured. I can use therasterio.plot.reshape_as_image()function to then reorder it into row, column, bands order :).
– krishnab
5 hours ago
Ahh, good tip. No I am not writing out to a raster again. I am taking the TIFF data and encoding it to aTFRecordsformat for some machine learning in Tensorflow. Kinda a long story but trying to be systematic about it. So I need to take the TIFF data, convert it to 8bit format, encode it as a string and write it to TFRecords. But then I need to decode the data from string in Tensorflow and validate the data went in properly. So I need to be able to check the decoded data and that is why I was using a PNG or JPEG format since they are easy to plot.
– krishnab
5 hours ago
Haha, I know it is not the easiest and that conversion from 16bit TIFF to 8bit loses information. But just need to get the basic prototype working and then can make the necessary fixes to do it right.
– krishnab
5 hours ago
add a comment |
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gdal.Translate does return an object, it returns a gdal.Dataset object.
from osgeo import gdal
in_ds = gdal.OpenEx('path/to/input.tif')
print(in_ds)
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x00000000037BE930> >
out_ds = gdal.Translate('path/to/output.tif', in_ds)
print(out_ds )
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x00000000037BE990> >
It has to write the translated output somewhere...
If you don't want to write to disk, write to memory (don't bother with the MEM driver), use the "VSIMEM" virtual filesystem to write a GeoTIFF to memory:
out_ds = gdal.Translate('/vsimem/in_memory_output.tif', in_ds)
You can then read it into a numpy array if you want.
out_arr = out_ds.ReadAsArray()
answered 5 hours ago
user2856user2856
30.4k258106
Oh this is great. Yeah, I will give this a try. This will make stuff a lot easier. Just to anticipate my next question, can I convert aDatasetobject to a numpy array using theds.GetRasterBand(1).ReadAsArray()function? Is that what you were thinking or am I thinking in the wrong direction.
– krishnab
5 hours ago
Oh thank you so much. I was trying to figure this out since yesterday. Haha, like if I had energy left I would thank you more :). Yeah, so that will load all the bands into an array. I was trying to figure out if I needed to manually stack each band into an RGB array or shift from a raster ordering of the data to an image ordering, etc. But this totally answers my question.
– krishnab
5 hours ago
Yep, that is what I figured. I can use therasterio.plot.reshape_as_image()function to then reorder it into row, column, bands order :).
– krishnab
5 hours ago
Ahh, good tip. No I am not writing out to a raster again. I am taking the TIFF data and encoding it to aTFRecordsformat for some machine learning in Tensorflow. Kinda a long story but trying to be systematic about it. So I need to take the TIFF data, convert it to 8bit format, encode it as a string and write it to TFRecords. But then I need to decode the data from string in Tensorflow and validate the data went in properly. So I need to be able to check the decoded data and that is why I was using a PNG or JPEG format since they are easy to plot.
– krishnab
5 hours ago
Haha, I know it is not the easiest and that conversion from 16bit TIFF to 8bit loses information. But just need to get the basic prototype working and then can make the necessary fixes to do it right.
– krishnab
5 hours ago
add a comment |
gdal.Translate does return an object, it returns a gdal.Dataset object.
from osgeo import gdal
in_ds = gdal.OpenEx('path/to/input.tif')
print(in_ds)
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x00000000037BE930> >
out_ds = gdal.Translate('path/to/output.tif', in_ds)
print(out_ds )
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x00000000037BE990> >
It has to write the translated output somewhere...
If you don't want to write to disk, write to memory (don't bother with the MEM driver), use the "VSIMEM" virtual filesystem to write a GeoTIFF to memory:
out_ds = gdal.Translate('/vsimem/in_memory_output.tif', in_ds)
You can then read it into a numpy array if you want.
out_arr = out_ds.ReadAsArray()
answered 5 hours ago
user2856user2856
30.4k258106
Oh this is great. Yeah, I will give this a try. This will make stuff a lot easier. Just to anticipate my next question, can I convert aDatasetobject to a numpy array using theds.GetRasterBand(1).ReadAsArray()function? Is that what you were thinking or am I thinking in the wrong direction.
– krishnab
5 hours ago
Oh thank you so much. I was trying to figure this out since yesterday. Haha, like if I had energy left I would thank you more :). Yeah, so that will load all the bands into an array. I was trying to figure out if I needed to manually stack each band into an RGB array or shift from a raster ordering of the data to an image ordering, etc. But this totally answers my question.
– krishnab
5 hours ago
Yep, that is what I figured. I can use therasterio.plot.reshape_as_image()function to then reorder it into row, column, bands order :).
– krishnab
5 hours ago
Ahh, good tip. No I am not writing out to a raster again. I am taking the TIFF data and encoding it to aTFRecordsformat for some machine learning in Tensorflow. Kinda a long story but trying to be systematic about it. So I need to take the TIFF data, convert it to 8bit format, encode it as a string and write it to TFRecords. But then I need to decode the data from string in Tensorflow and validate the data went in properly. So I need to be able to check the decoded data and that is why I was using a PNG or JPEG format since they are easy to plot.
– krishnab
5 hours ago
Haha, I know it is not the easiest and that conversion from 16bit TIFF to 8bit loses information. But just need to get the basic prototype working and then can make the necessary fixes to do it right.
– krishnab
5 hours ago
add a comment |
gdal.Translate does return an object, it returns a gdal.Dataset object.
from osgeo import gdal
in_ds = gdal.OpenEx('path/to/input.tif')
print(in_ds)
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x00000000037BE930> >
out_ds = gdal.Translate('path/to/output.tif', in_ds)
print(out_ds )
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x00000000037BE990> >
It has to write the translated output somewhere...
If you don't want to write to disk, write to memory (don't bother with the MEM driver), use the "VSIMEM" virtual filesystem to write a GeoTIFF to memory:
out_ds = gdal.Translate('/vsimem/in_memory_output.tif', in_ds)
You can then read it into a numpy array if you want.
out_arr = out_ds.ReadAsArray()
answered 5 hours ago
user2856user2856
30.4k258106
gdal.Translate does return an object, it returns a gdal.Dataset object.
from osgeo import gdal
in_ds = gdal.OpenEx('path/to/input.tif')
print(in_ds)
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x00000000037BE930> >
out_ds = gdal.Translate('path/to/output.tif', in_ds)
print(out_ds )
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x00000000037BE990> >
It has to write the translated output somewhere...
If you don't want to write to disk, write to memory (don't bother with the MEM driver), use the "VSIMEM" virtual filesystem to write a GeoTIFF to memory:
out_ds = gdal.Translate('/vsimem/in_memory_output.tif', in_ds)
You can then read it into a numpy array if you want.
out_arr = out_ds.ReadAsArray()
answered 5 hours ago
user2856user2856
30.4k258106
edited 5 hours ago
answered 5 hours ago
user2856user2856
30.4k258106
answered 5 hours ago
user2856user2856
30.4k258106
answered 5 hours ago
user2856user2856
30.4k258106
30.4k258106
Oh this is great. Yeah, I will give this a try. This will make stuff a lot easier. Just to anticipate my next question, can I convert aDatasetobject to a numpy array using theds.GetRasterBand(1).ReadAsArray()function? Is that what you were thinking or am I thinking in the wrong direction.
– krishnab
5 hours ago
Oh thank you so much. I was trying to figure this out since yesterday. Haha, like if I had energy left I would thank you more :). Yeah, so that will load all the bands into an array. I was trying to figure out if I needed to manually stack each band into an RGB array or shift from a raster ordering of the data to an image ordering, etc. But this totally answers my question.
– krishnab
5 hours ago
Yep, that is what I figured. I can use therasterio.plot.reshape_as_image()function to then reorder it into row, column, bands order :).
– krishnab
5 hours ago
Ahh, good tip. No I am not writing out to a raster again. I am taking the TIFF data and encoding it to aTFRecordsformat for some machine learning in Tensorflow. Kinda a long story but trying to be systematic about it. So I need to take the TIFF data, convert it to 8bit format, encode it as a string and write it to TFRecords. But then I need to decode the data from string in Tensorflow and validate the data went in properly. So I need to be able to check the decoded data and that is why I was using a PNG or JPEG format since they are easy to plot.
– krishnab
5 hours ago
Haha, I know it is not the easiest and that conversion from 16bit TIFF to 8bit loses information. But just need to get the basic prototype working and then can make the necessary fixes to do it right.
– krishnab
5 hours ago
add a comment |
Oh this is great. Yeah, I will give this a try. This will make stuff a lot easier. Just to anticipate my next question, can I convert aDatasetobject to a numpy array using theds.GetRasterBand(1).ReadAsArray()function? Is that what you were thinking or am I thinking in the wrong direction.
– krishnab
5 hours ago
Oh thank you so much. I was trying to figure this out since yesterday. Haha, like if I had energy left I would thank you more :). Yeah, so that will load all the bands into an array. I was trying to figure out if I needed to manually stack each band into an RGB array or shift from a raster ordering of the data to an image ordering, etc. But this totally answers my question.
– krishnab
5 hours ago
Yep, that is what I figured. I can use therasterio.plot.reshape_as_image()function to then reorder it into row, column, bands order :).
– krishnab
5 hours ago
Ahh, good tip. No I am not writing out to a raster again. I am taking the TIFF data and encoding it to aTFRecordsformat for some machine learning in Tensorflow. Kinda a long story but trying to be systematic about it. So I need to take the TIFF data, convert it to 8bit format, encode it as a string and write it to TFRecords. But then I need to decode the data from string in Tensorflow and validate the data went in properly. So I need to be able to check the decoded data and that is why I was using a PNG or JPEG format since they are easy to plot.
– krishnab
5 hours ago
Haha, I know it is not the easiest and that conversion from 16bit TIFF to 8bit loses information. But just need to get the basic prototype working and then can make the necessary fixes to do it right.
– krishnab
5 hours ago
Oh this is great. Yeah, I will give this a try. This will make stuff a lot easier. Just to anticipate my next question, can I convert a
Dataset object to a numpy array using the ds.GetRasterBand(1).ReadAsArray() function? Is that what you were thinking or am I thinking in the wrong direction.– krishnab
5 hours ago
Oh this is great. Yeah, I will give this a try. This will make stuff a lot easier. Just to anticipate my next question, can I convert a
Dataset object to a numpy array using the ds.GetRasterBand(1).ReadAsArray() function? Is that what you were thinking or am I thinking in the wrong direction.– krishnab
5 hours ago
Oh thank you so much. I was trying to figure this out since yesterday. Haha, like if I had energy left I would thank you more :). Yeah, so that will load all the bands into an array. I was trying to figure out if I needed to manually stack each band into an RGB array or shift from a raster ordering of the data to an image ordering, etc. But this totally answers my question.
– krishnab
5 hours ago
Oh thank you so much. I was trying to figure this out since yesterday. Haha, like if I had energy left I would thank you more :). Yeah, so that will load all the bands into an array. I was trying to figure out if I needed to manually stack each band into an RGB array or shift from a raster ordering of the data to an image ordering, etc. But this totally answers my question.
– krishnab
5 hours ago
Yep, that is what I figured. I can use the
rasterio.plot.reshape_as_image() function to then reorder it into row, column, bands order :).– krishnab
5 hours ago
Yep, that is what I figured. I can use the
rasterio.plot.reshape_as_image() function to then reorder it into row, column, bands order :).– krishnab
5 hours ago
Ahh, good tip. No I am not writing out to a raster again. I am taking the TIFF data and encoding it to a
TFRecords format for some machine learning in Tensorflow. Kinda a long story but trying to be systematic about it. So I need to take the TIFF data, convert it to 8bit format, encode it as a string and write it to TFRecords. But then I need to decode the data from string in Tensorflow and validate the data went in properly. So I need to be able to check the decoded data and that is why I was using a PNG or JPEG format since they are easy to plot.– krishnab
5 hours ago
Ahh, good tip. No I am not writing out to a raster again. I am taking the TIFF data and encoding it to a
TFRecords format for some machine learning in Tensorflow. Kinda a long story but trying to be systematic about it. So I need to take the TIFF data, convert it to 8bit format, encode it as a string and write it to TFRecords. But then I need to decode the data from string in Tensorflow and validate the data went in properly. So I need to be able to check the decoded data and that is why I was using a PNG or JPEG format since they are easy to plot.– krishnab
5 hours ago
Haha, I know it is not the easiest and that conversion from 16bit TIFF to 8bit loses information. But just need to get the basic prototype working and then can make the necessary fixes to do it right.
– krishnab
5 hours ago
Haha, I know it is not the easiest and that conversion from 16bit TIFF to 8bit loses information. But just need to get the basic prototype working and then can make the necessary fixes to do it right.
– krishnab
5 hours ago
add a comment |
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There is a memory driver which may help gdal.org/frmt_mem.html I'm not sure how you could leverage the pointer in python but it works great in C++ (until you create a raster larger than your available memory). TranslateInternal() would be calling a C external link, you could find it in the source code if you understand ANSI C/C++. It might be best to write to a file in your os.environ.get('temp') then gdal.Open the temp raster.
– Michael Stimson
6 hours ago