Terraflow temporary file issue

2025-03-17 15:28 UTC o3-mini-high Open in ChatGPT ↗

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WHY does terraflow fail?

Algorithm ‘r.terraflow’ starting… Input parameters: { ‘-s’ : False, ‘GRASS_RASTER_FORMAT_META’ : ”, ‘GRASS_RASTER_FORMAT_OPT’ : ”, ‘GRASS_REGION_CELLSIZE_PARAMETER’ : 0, ‘GRASS_REGION_PARAMETER’ : None, ‘accumulation’ : ‘TEMPORARY_OUTPUT’, ‘d8cut’ : None, ‘direction’ : ‘TEMPORARY_OUTPUT’, ‘elevation’ : ‘F:/Github/ULC/ioniq-geography/gis/data/dem/korea/korea_COP30_EPSG3857_zoomin.tif’, ‘filled’ : ‘TEMPORARY_OUTPUT’, ‘memory’ : 300, ‘stats’ : ‘TEMPORARY_OUTPUT’, ‘swatershed’ : ‘TEMPORARY_OUTPUT’, ‘tci’ : ‘TEMPORARY_OUTPUT’ }

g.proj -c wkt=“C:/Users/GeorgeAdamon/AppData/Local/Temp/processing_XCbuLc/5296583370f0428fa7f566c111d3926b/crs.prj” r.in.gdal input=“F:\Github\ULC\ioniq-geography\gis\data\dem\korea\korea_COP30_EPSG3857_zoomin.tif” band=1 output=“rast_67d83f7300af212” —overwrite -o g.region n=4555545.49167395 s=4552047.7781976275 e=14280217.487746727 w=14276514.026418855 res=34.291308591401 r.terraflow elevation=rast_67d83f7300af212 memory=300 filled=filled71f08ee7b9824caf8417de5d33e547d3 direction=direction71f08ee7b9824caf8417de5d33e547d3 swatershed=swatershed71f08ee7b9824caf8417de5d33e547d3 accumulation=accumulation71f08ee7b9824caf8417de5d33e547d3 tci=tci71f08ee7b9824caf8417de5d33e547d3 stats=“C:/Users/GeorgeAdamon/AppData/Local/Temp/processing_XCbuLc/e8a8ca0ff8334c5db486fc0f68c510e7/stats.txt” —overwrite g.region raster=filled71f08ee7b9824caf8417de5d33e547d3 r.out.gdal -t -m input=“filled71f08ee7b9824caf8417de5d33e547d3” output=“C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\111136a5d06e47d1bfa0323607f2a1da\filled.tif” format=“GTiff” createopt=“TFW=YES,COMPRESS=LZW” —overwrite g.region raster=direction71f08ee7b9824caf8417de5d33e547d3 r.out.gdal -t -m input=“direction71f08ee7b9824caf8417de5d33e547d3” output=“C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\7ec5b820313e4a6cac211a2cf44eb6ad\direction.tif” format=“GTiff” createopt=“TFW=YES,COMPRESS=LZW” —overwrite g.region raster=swatershed71f08ee7b9824caf8417de5d33e547d3 r.out.gdal -t -m input=“swatershed71f08ee7b9824caf8417de5d33e547d3” output=“C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\d958bbd71d8d43afb0d113a216f53918\swatershed.tif” format=“GTiff” createopt=“TFW=YES,COMPRESS=LZW” —overwrite g.region raster=accumulation71f08ee7b9824caf8417de5d33e547d3 r.out.gdal -t -m input=“accumulation71f08ee7b9824caf8417de5d33e547d3” output=“C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\58836fcf8ba94176b49f04733d41e86a\accumulation.tif” format=“GTiff” createopt=“TFW=YES,COMPRESS=LZW” —overwrite g.region raster=tci71f08ee7b9824caf8417de5d33e547d3 r.out.gdal -t -m input=“tci71f08ee7b9824caf8417de5d33e547d3” output=“C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\bfa1a7ff914b45fd8f18ca7ec5f70ebf\tci.tif” format=“GTiff” createopt=“TFW=YES,COMPRESS=LZW” —overwrite WARNING: Concurrent mapset locking is not supported on Windows C:\Users\GeorgeAdamon\Documents>chcp 1252 1>NUL C:\Users\GeorgeAdamon\Documents>g.proj -c wkt=“C:/Users/GeorgeAdamon/AppData/Local/Temp/processing_XCbuLc/5296583370f0428fa7f566c111d3926b/crs.prj” WARNING: Updating spatial reference with embedded proj4 definition Default region was updated to the new projection, but if you have multiple mapsets g.region -d should be run in each to update the region from the default Projection information updated C:\Users\GeorgeAdamon\Documents>r.in.gdal input=“F:\Github\ULC\ioniq-geography\gis\data\dem\korea\korea_COP30_EPSG3857_zoomin.tif” band=1 output=“rast_67d83f7300af212” —overwrite -o WARNING: Updating spatial reference with embedded proj4 definition Over-riding projection check Importing raster map <rast_67d83f7300af212>… 0..3..6..9..12..15..18..21..24..27..30..33..36..39..42..45..48..51..54..57..60..63..66..69..72..75..78..81..84..87..90..93..96..99..100 C:\Users\GeorgeAdamon\Documents>g.region n=4555545.49167395 s=4552047.7781976275 e=14280217.487746727 w=14276514.026418855 res=34.291308591401 C:\Users\GeorgeAdamon\Documents>r.terraflow elevation=rast_67d83f7300af212 memory=300 filled=filled71f08ee7b9824caf8417de5d33e547d3 direction=direction71f08ee7b9824caf8417de5d33e547d3 swatershed=swatershed71f08ee7b9824caf8417de5d33e547d3 accumulation=accumulation71f08ee7b9824caf8417de5d33e547d3 tci=tci71f08ee7b9824caf8417de5d33e547d3 stats=“C:/Users/GeorgeAdamon/AppData/Local/Temp/processing_XCbuLc/e8a8ca0ff8334c5db486fc0f68c510e7/stats.txt” —overwrite MFD flow direction D8CUT=999999986991104.000000 Memory size: 300.00M (314572800) bytes ami_single_temp_name: G_mkstemp() failed: : No such file or directory Assertion failed: 0, file ami_stream.cpp, line 91 C:\Users\GeorgeAdamon\Documents>g.region raster=filled71f08ee7b9824caf8417de5d33e547d3 ERROR: Raster map not found C:\Users\GeorgeAdamon\Documents>r.out.gdal -t -m input=“filled71f08ee7b9824caf8417de5d33e547d3” output=“C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\111136a5d06e47d1bfa0323607f2a1da\filled.tif” format=“GTiff” createopt=“TFW=YES,COMPRESS=LZW” —overwrite ERROR: Raster map or group not found C:\Users\GeorgeAdamon\Documents>g.region raster=direction71f08ee7b9824caf8417de5d33e547d3 ERROR: Raster map not found C:\Users\GeorgeAdamon\Documents>r.out.gdal -t -m input=“direction71f08ee7b9824caf8417de5d33e547d3” output=“C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\7ec5b820313e4a6cac211a2cf44eb6ad\direction.tif” format=“GTiff” createopt=“TFW=YES,COMPRESS=LZW” —overwrite ERROR: Raster map or group not found C:\Users\GeorgeAdamon\Documents>g.region raster=swatershed71f08ee7b9824caf8417de5d33e547d3 ERROR: Raster map not found C:\Users\GeorgeAdamon\Documents>r.out.gdal -t -m input=“swatershed71f08ee7b9824caf8417de5d33e547d3” output=“C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\d958bbd71d8d43afb0d113a216f53918\swatershed.tif” format=“GTiff” createopt=“TFW=YES,COMPRESS=LZW” —overwrite ERROR: Raster map or group not found C:\Users\GeorgeAdamon\Documents>g.region raster=accumulation71f08ee7b9824caf8417de5d33e547d3 ERROR: Raster map not found C:\Users\GeorgeAdamon\Documents>r.out.gdal -t -m input=“accumulation71f08ee7b9824caf8417de5d33e547d3” output=“C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\58836fcf8ba94176b49f04733d41e86a\accumulation.tif” format=“GTiff” createopt=“TFW=YES,COMPRESS=LZW” —overwrite ERROR: Raster map or group not found C:\Users\GeorgeAdamon\Documents>g.region raster=tci71f08ee7b9824caf8417de5d33e547d3 ERROR: Raster map not found C:\Users\GeorgeAdamon\Documents>r.out.gdal -t -m input=“tci71f08ee7b9824caf8417de5d33e547d3” output=“C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\bfa1a7ff914b45fd8f18ca7ec5f70ebf\tci.tif” format=“GTiff” createopt=“TFW=YES,COMPRESS=LZW” —overwrite ERROR: Raster map or group not found C:\Users\GeorgeAdamon\Documents>exit Press any key to continue … Execution completed in 2.69 seconds Results: filled: C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\111136a5d06e47d1bfa0323607f2a1da\filled.tif direction: C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\7ec5b820313e4a6cac211a2cf44eb6ad\direction.tif swatershed: C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\d958bbd71d8d43afb0d113a216f53918\swatershed.tif accumulation: C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\58836fcf8ba94176b49f04733d41e86a\accumulation.tif tci: C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\bfa1a7ff914b45fd8f18ca7ec5f70ebf\tci.tif stats: C:\Users\GeorgeAdamon\AppData\Local\Temp\processing_XCbuLc\e8a8ca0ff8334c5db486fc0f68c510e7\stats.txt

Loading resulting layers The following layers were not correctly generated. • C:/Users/GeorgeAdamon/AppData/Local/Temp/processing_XCbuLc/111136a5d06e47d1bfa0323607f2a1da/filled.tif • C:/Users/GeorgeAdamon/AppData/Local/Temp/processing_XCbuLc/58836fcf8ba94176b49f04733d41e86a/accumulation.tif • C:/Users/GeorgeAdamon/AppData/Local/Temp/processing_XCbuLc/7ec5b820313e4a6cac211a2cf44eb6ad/direction.tif • C:/Users/GeorgeAdamon/AppData/Local/Temp/processing_XCbuLc/bfa1a7ff914b45fd8f18ca7ec5f70ebf/tci.tif • C:/Users/GeorgeAdamon/AppData/Local/Temp/processing_XCbuLc/d958bbd71d8d43afb0d113a216f53918/swatershed.tif You can check the ‘Log Messages Panel’ in QGIS main window to find more information about the execution of the algorithm.

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The error message

ami_single_temp_name: G_mkstemp() failed: : No such file or directory
Assertion failed: 0, file ami_stream.cpp, line 91

indicates that Terraflow is unable to create a necessary temporary file. In other words, when the GRASS module attempts to generate a temporary file using its internal function (G_mkstemp()), it fails—likely because it cannot locate or write to the expected temporary directory.

Some common causes for this issue include:

• Temporary Directory Misconfiguration: The environment variable that points to your system’s temporary folder (like TMP or TEMP) may not be set correctly, or the directory might not exist.
• Permission Issues: The directory where temporary files are to be stored might not have the proper write permissions.
• Platform-Specific Limitations: GRASS on Windows sometimes exhibits issues with concurrent mapset locking and temporary file handling, as hinted by the warning:

  “WARNING: Concurrent mapset locking is not supported on Windows”

Because the temporary file creation fails, the algorithm cannot generate the intermediate outputs (such as the filled, direction, swatershed, accumulation, and tci maps), and the process stops with an assertion failure.

Possible Solutions:

• Verify Temporary Directory Settings: Ensure that the environment variables (TMP, TEMP) point to a valid, writable directory. You might try setting these explicitly before running Terraflow.
• Check Permissions: Confirm that your user account has the necessary write permissions for the temporary directory.
• Update or Run in a Different Environment: Consider updating GRASS or using Terraflow on a Linux system where temporary file management might be more robust.

In summary, Terraflow fails because it cannot create a temporary file due to issues with file/directory accessibility or configuration in your Windows environment.