Note: this ticket applies only to Raster datasets (georeferenced maps, satellite imagery, etc.).
For the version specific to Vector data, see #1162.
This ticket is for exploring ways to display information about the bands and color information present in raster images as a preview so the user can get a general idea of the data. This is different from inspection ("what info is at the pixel that I clicked?") and is instead intended to represent a general survey or broad understanding of all the data or a preselected sample, to help the user make an informed decision about downloading. It's more accessible and can be displayed without asking the user to pick a point using a mouse.
Rasters usually contain information available via GeoServer or other queries about what pixels and bands make up the image, as well as its coordinate system and other info. A gdlinfo query on a satellite image in .jp2 format contains, for example:
These three bands correspond to R/G/B values of each pixel (i.e. a "normal" image representing what a camera/eye would see), but some rasters (e.g. LANDSAT) have more or fewer than 3 bands, and those bands may represent non-visual information like height.
Note: this ticket applies only to Raster datasets (georeferenced maps, satellite imagery, etc.). For the version specific to Vector data, see #1162.
This ticket is for exploring ways to display information about the bands and color information present in raster images as a preview so the user can get a general idea of the data. This is different from inspection ("what info is at the pixel that I clicked?") and is instead intended to represent a general survey or broad understanding of all the data or a preselected sample, to help the user make an informed decision about downloading. It's more accessible and can be displayed without asking the user to pick a point using a mouse.
Rasters usually contain information available via GeoServer or other queries about what pixels and bands make up the image, as well as its coordinate system and other info. A gdlinfo query on a satellite image in .jp2 format contains, for example:
These three bands correspond to R/G/B values of each pixel (i.e. a "normal" image representing what a camera/eye would see), but some rasters (e.g. LANDSAT) have more or fewer than 3 bands, and those bands may represent non-visual information like height.