What is raster2pgsql?
The raster2pgsql is a raster loader executable that loads GDAL supported raster formats into sql suitable for loading into a PostGIS raster table. It is capable of loading folders of raster files as well as creating overviews of rasters.
What is raster in PostGIS?
raster is a spatial data type used to represent raster data such as those imported from JPEGs, TIFFs, PNGs, digital elevation models. Each raster has 1 or more bands each having a set of pixel values. Rasters can be georeferenced. Requires PostGIS be compiled with GDAL support.
Can you store raster in PostGIS?
The raster data type in PostGIS can be used to store any kind of raster data: images, elevation grids, model outputs, and more. One band, four band, multi-band and anything in between. This flexibility leads some beginners to dump all their imagery into the database as “step one” in a system design.
What is Postgis_topology?
The PostGIS Topology types and functions are used to manage topological objects such as faces, edges and nodes. Sandro Santilli’s presentation at PostGIS Day Paris 2011 conference gives a good synopsis of PostGIS Topology and where it is headed Topology with PostGIS 2.0 slide deck.
What is raster data types?
Raster dataset. Raster datasets are single images that are stored in the database. These images may be as simple as a single image imported from a file on disk to a large image that has been created by mosaicking or appending multiple images together into a single, large, and seamless image.
What is pgRouting?
pgRouting is an extension that adds routing and other network analysis functionality to PostGIS/PostgreSQL databases.
What is raster resolution?
The spatial resolution of a raster refers to the size of the cells in a raster dataset and the ratio of screen pixels to image pixels at the current map scale. For example, one screen pixel can be the result of nine image pixels resampled into one—a raster resolution of 1:9.
What are the different types of resolution in remote sensing?
Resolution can vary depending on the satellite’s orbit and sensor design. There are four types of resolution to consider for any dataset—radiometric, spatial, spectral, and temporal.
What is raster data examples?
There are two types of raster data: continuous and discrete. An example of discrete raster data is population density. Continuous data examples are temperature and elevation measurements. There are also three types of raster datasets: thematic data, spectral data, and pictures (imagery).
What is raster data used for?
Picture rasters are often used as attributes in tables—they can be displayed with your geographic data and are used to convey additional information about map features. A common use of raster data in a GIS is as a background display for other feature layers.