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| main:logiciels:gdal:couteau_suisse:gdalbuildvrt [2010/12/28 14:21] – Yves | main:logiciels:gdal:couteau_suisse:gdalbuildvrt [Date inconnue] (Version actuelle) – supprimée - modification externe (Date inconnue) 127.0.0.1 | ||
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| - | ====== gdalbuildvrt ====== | ||
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| - | Construit un VRT à partir d'une liste de jeu de données. | ||
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| - | ===== Usage ===== | ||
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| - | gdalbuildvrt [-tileindex field_name] [-resolution {highest|lowest|average|user}] | ||
| - | [-tr xres yres] [-tap] [-separate] [-allow_projection_difference] [-q] | ||
| - | [-te xmin ymin xmax ymax] [-addalpha] [-hidenodata] | ||
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| - | ===== Description ===== | ||
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| - | Ce programme construit un fichier VRT (Jeu de données virtuel) qui est une mosaïque d'une liste de jeux de données de GDAL en entrée. La liste des jeux de données de GDAL en entrée peut être définie à la fin de la ligne de commande, ou placer dans un fichier texte (un nom de fichier par ligne) pour les listes importantes, | ||
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| - | With -separate, each files goes into a separate stacked band in the VRT band. Otherwise, the files are considered as tiles of a larger mosaic and the VRT file has as many bands as one of the input files. | ||
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| - | Si un jeu de données de GDAL est réalisé à partir de plusieurs sous jeu de données et ne possède aucune bande raster, tous les sous jeux de données seront ajoutés au fichier VRT plutôt que le jeu de données lui-même. | ||
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| - | '' | ||
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| - | S'il y a un certain taux de recouvrement, | ||
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| - | This utility is somehow equivalent to the gdal_vrtmerge.py utility and is build by default in GDAL 1.6.1. | ||
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| - | * **-tileindex :** Use the specified value as the tile index field, instead of the default value with is ' | ||
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| - | * **-resolution {highest|lowest|average|user} :** Si la résolution de tous les fichiers en entrée n'est pas la même, l' | ||
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| - | * **-tr xres yres :** | ||
| - | (starting with GDAL 1.7.0) set target resolution. The values must be expressed in georeferenced units. Both must be positive values. Specifying those values is of course incompatible with highest|lowest|average values for -resolution option. | ||
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| - | * **-tap :** | ||
| - | (GDAL >= 1.8.0) (target aligned pixels) align the coordinates of the extent of the output file to the values of the -tr, such that the aligned extent includes the minimum extent. | ||
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| - | * **-te xmin ymin xmax ymax :** | ||
| - | (starting with GDAL 1.7.0) set georeferenced extents of VRT file. The values must be expressed in georeferenced units. If not specified, the extent of the VRT is the minimum bounding box of the set of source rasters. | ||
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| - | * **-addalpha :** | ||
| - | (starting with GDAL 1.7.0) Adds an alpha mask band to the VRT when the source raster have none. Mainly useful for RGB sources (or grey-level sources). The alpha band is filled on-the-fly with the value 0 in areas without any source raster, and with value 255 in areas with source raster. The effect is that a RGBA viewer will render the areas without source rasters as transparent and areas with source rasters as opaque. This option is not compatible with -separate. | ||
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| - | * **-hidenodata :** | ||
| - | (starting with GDAL 1.7.0) Even if any band contains nodata value, giving this option makes the VRT band not report the NoData. Useful when you want to control the background color of the dataset. By using along with the -addalpha option, you can prepare a dataset which doesn' | ||
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| - | * **-srcnodata value [value...] :** | ||
| - | (starting with GDAL 1.7.0) Set nodata values for input bands (different values can be supplied for each band). If more than one value is supplied all values should be quoted to keep them together as a single operating system argument. If the option is not specified, the instrinsic nodata settings on the source datasets will be used (if they exist). The value set by this option is written in the NODATA element of each ComplexSource element. Use a value of None to ignore intrinsic nodata settings on the source datasets. | ||
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| - | * **-vrtnodata value [value...] :** | ||
| - | (starting with GDAL 1.7.0) Set nodata values at the VRT band level (different values can be supplied for each band). If more than one value is supplied all values should be quoted to keep them together as a single operating system argument. If the option is not specified, instrinsic nodata settings on the first dataset will be used (if they exist). The value set by this option is written in the NoDataValue element of each VRTRasterBand element. Use a value of None to ignore intrinsic nodata settings on the source datasets. | ||
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| - | * **-separate :** | ||
| - | (starting with GDAL 1.7.0) Place each input file into a separate stacked band. In that case, only the first band of each dataset will be placed into a new band. Contrary to the default mode, it is not required that all bands have the same datatype. | ||
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| - | * **-allow_projection_difference :** | ||
| - | (starting with GDAL 1.7.0) When this option is specified, the utility will accept to make a VRT even if the input datasets have not the same projection. Note: this does not mean that they will be reprojected. Their projection will just be ignored. | ||
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| - | * **-input_file_list :** pour définir un fichier texte avec un nom de fichier à chaque ligne. | ||
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| - | * **-q :** (à partir de GDAL 1.7.0) pour désactiver la barre de progression dans la console. | ||
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| - | * **-overwrite :** écrase le VRT s'il existe déjà. | ||
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| - | ===== Exemple ===== | ||
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| - | Exemple : | ||
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| - | gdalbuildvrt doq_index.vrt doq/*.tif | ||
| - | gdalbuildvrt -input_file_list my_liste.txt doq_index.vrt | ||
| - | gdalbuildvrt -separate rgb.vrt red.tif green.tif blue.tif | ||
| - | gdalbuildvrt -hidenodata -vrtnodata "0 0 255" doq_index.vrt doq/*.tif | ||
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| - | ---- | ||
| - | --- // | ||
