Differences
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supported_map_formats [2017/05/23 00:06] hermann [Additional Notes] |
supported_map_formats [2024/05/29 18:59] (current) hermann [GDAL Limitations] |
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| | Several file formats do not support the storage of layer names. | Use a [[supported_map_formats#Virtual Format|VRT file]] or an auxiliary PAM XML file to keep this information. The ERMapper file format also has support to layer names. | | | Several file formats do not support the storage of layer names. | Use a [[supported_map_formats#Virtual Format|VRT file]] or an auxiliary PAM XML file to keep this information. The ERMapper file format also has support to layer names. | | ||
| | @yellow:The categories must start from 0 and their definition must be contiguous. | Unfortunately, the only way to workaround this limitation is defining dummy categories (Dinamica EGO does this when representing non-contiguous categories in a GDAL supported format) or using the ERMapper file format. | | | @yellow:The categories must start from 0 and their definition must be contiguous. | Unfortunately, the only way to workaround this limitation is defining dummy categories (Dinamica EGO does this when representing non-contiguous categories in a GDAL supported format) or using the ERMapper file format. | | ||
| - | | @yellow:Some formats do not preserve category colors when a specified number of bits per sample is used. | Unfortunately, the only way to workaround this limitation is using a different format or choosing a number of bits per sample that does not have this limitation for a given format. For example, Geotiff format only stores category colors when the cell type is 8 bits. | | + | | @yellow:Some formats do not preserve category colors when a specified number of bits per sample is used. | Unfortunately, the only way to workaround this limitation is using a different format or choosing a number of bits per sample that does not have this limitation for a given format. For example, Geotiff format only stores category colors when the cell type is 8 bits unsigned. | |
| | @pink:Categories represented by negative values are not supported. | Unfortunately, there is no way to workaround this limitation, except by avoiding the use of negative categories. | | | @pink:Categories represented by negative values are not supported. | Unfortunately, there is no way to workaround this limitation, except by avoiding the use of negative categories. | | ||