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Cell Size Discrepancy When Exporting TIFFs Using QGIS
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QGIS Madeira 3.4.3
I am downsampling 100m TIFFs to 1000m. I am using Export - Save As GeoTIFF specifying cellsize 1000m, and the appropriate No Data value. This works just fine with the first four files. The output is a GeoTIFF with pixel size 1000, -1000.
However, I have another folder of 100m TIFFs and exporting them produces GeoTIFFs with pixel size 999.404,-999.667
All of the TIFFs are in the same Albers Equal Area projection on the NAD 83 datum. There is some variation in their origin points and extents.
Saving as a GeoPackage rather than a TIFF produces exactly the same discrepancy.
A discrepancy of half a metre in a thousand does not sound large, but with 800 cells spanning the coast it adds up to 400m difference. Besides, the point of the exercise is to get a broad selection of raters to align precisely in advance of analysis.
Has anyone seen this sort of discrepancy before? Solutions? Work arounds?
Regards,
Doug Hrynyk
qgis geotiff-tiff export cell-size
asked 2 mins ago
Doug HDoug H
12
add a comment |
QGIS Madeira 3.4.3
I am downsampling 100m TIFFs to 1000m. I am using Export - Save As GeoTIFF specifying cellsize 1000m, and the appropriate No Data value. This works just fine with the first four files. The output is a GeoTIFF with pixel size 1000, -1000.
However, I have another folder of 100m TIFFs and exporting them produces GeoTIFFs with pixel size 999.404,-999.667
All of the TIFFs are in the same Albers Equal Area projection on the NAD 83 datum. There is some variation in their origin points and extents.
Saving as a GeoPackage rather than a TIFF produces exactly the same discrepancy.
A discrepancy of half a metre in a thousand does not sound large, but with 800 cells spanning the coast it adds up to 400m difference. Besides, the point of the exercise is to get a broad selection of raters to align precisely in advance of analysis.
Has anyone seen this sort of discrepancy before? Solutions? Work arounds?
Regards,
Doug Hrynyk
qgis geotiff-tiff export cell-size
asked 2 mins ago
Doug HDoug H
12
add a comment |
QGIS Madeira 3.4.3
I am downsampling 100m TIFFs to 1000m. I am using Export - Save As GeoTIFF specifying cellsize 1000m, and the appropriate No Data value. This works just fine with the first four files. The output is a GeoTIFF with pixel size 1000, -1000.
However, I have another folder of 100m TIFFs and exporting them produces GeoTIFFs with pixel size 999.404,-999.667
All of the TIFFs are in the same Albers Equal Area projection on the NAD 83 datum. There is some variation in their origin points and extents.
Saving as a GeoPackage rather than a TIFF produces exactly the same discrepancy.
A discrepancy of half a metre in a thousand does not sound large, but with 800 cells spanning the coast it adds up to 400m difference. Besides, the point of the exercise is to get a broad selection of raters to align precisely in advance of analysis.
Has anyone seen this sort of discrepancy before? Solutions? Work arounds?
Regards,
Doug Hrynyk
qgis geotiff-tiff export cell-size
asked 2 mins ago
Doug HDoug H
12
QGIS Madeira 3.4.3
I am downsampling 100m TIFFs to 1000m. I am using Export - Save As GeoTIFF specifying cellsize 1000m, and the appropriate No Data value. This works just fine with the first four files. The output is a GeoTIFF with pixel size 1000, -1000.
However, I have another folder of 100m TIFFs and exporting them produces GeoTIFFs with pixel size 999.404,-999.667
All of the TIFFs are in the same Albers Equal Area projection on the NAD 83 datum. There is some variation in their origin points and extents.
Saving as a GeoPackage rather than a TIFF produces exactly the same discrepancy.
A discrepancy of half a metre in a thousand does not sound large, but with 800 cells spanning the coast it adds up to 400m difference. Besides, the point of the exercise is to get a broad selection of raters to align precisely in advance of analysis.
Has anyone seen this sort of discrepancy before? Solutions? Work arounds?
Regards,
Doug Hrynyk
qgis geotiff-tiff export cell-size
qgis geotiff-tiff export cell-size
asked 2 mins ago
Doug HDoug H
12
asked 2 mins ago
Doug HDoug H
12
asked 2 mins ago
Doug HDoug H
12
asked 2 mins ago
Doug HDoug H
12
asked 2 mins ago
Doug HDoug H
12
12
add a comment |
add a comment |
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