DEMTOOLS
A collection of Python tools for working with DEM (Digital Elevation Model) raster files.
GDAL Installation: GDAL is required for this package. For conda environments, use
conda install gdalto install GDAL. For non-conda environments, download the appropriate wheel file from https://github.com/cgohlke/geospatial-wheels/releases to install GDAL.
Installation
pip install -e .
Features
- chgnodata: Convert (replace) the nodata value of GeoTIFF files, updating pixel data accordingly
- defnodata: Assign a nodata value to GeoTIFF files without modifying pixel data (metadata only)
- csv2tif: Convert a plain-numeric CSV raster grid to a GeoTIFF file
Usage
Command-line
# List all available commands
demtools-info
# Convert nodata values for all TIF files in the current directory
chgnodata -a
# Convert nodata of a single file to -9999
chgnodata -i dem.tif -v -9999
# Set nodata metadata for all TIF files (no pixel data change)
defnodata -a -v -9999
# Convert a CSV grid to GeoTIFF
csv2tif -i grid.csv -o dem.tif --xll 250000 --yll 2500000 --cellsize 5 --epsg 32648
Python API
from demtools import chgnodata, defnodata, csv2tif
# Convert nodata value in a raster file
chgnodata.convert_nodata_value("dem.tif", output_nodata=-9999)
# Assign nodata metadata without touching pixel values
defnodata.define_nodata_value("dem.tif", nodata_value=-9999)
# Convert CSV grid to GeoTIFF
csv2tif.csv_to_tif(
input_csv="grid.csv",
output_tif="dem.tif",
xll=250000,
yll=2500000,
cellsize=5,
nodata=-999,
epsg=32648,
)
Notes
chgnodataanddefnodataautomatically create aRAS_BAK/directory with backup copies before modifying files.csv2tifexpects a plain numeric CSV (no headers), with rows ordered from north to south.- GDAL must be installed separately via conda or a pre-built wheel; it is not listed in
requirements.txtas it cannot be reliably installed via pip on all platforms.
1 maintainer
Metadata
1 maintainer
Release files for demtools 0.11.0
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