I have just imported a Landsat path and row shapefile into PostGIS from http://landsat.usgs.gov/tools_csf.php. I thought this might have some general utility when looking for images (for example from http://www.landsat.org/ortho/ortho_max.htm) , although there are of course very many sites (eg GLCF) that have the same information.
This is a marker for work in progress. Do not cite. This morning I was contacted in order to provide geographical information for one of our partners in the Reforlan project. The aim of the research is to find priority areas for forest restoration. The question of how to go about the analysis is thought…
El archivo arriba es un gif animado. Haz clic en el mapa para ver la animación, o guardarlo localmente. Nota que los tonos desde amarillo a azul muestra la pluviosidad sobrepuesto.
It would seem reasonable to assume that research aimed to fill a basic knowledge gap should receive more attention than projects aimed at evaluating complex untestable theory. However in the field of tropical forest ecology it not always clear that fundamental basic knowledge gaps are either being identified or filled quickly enough. An issue that…
PostGIS does not support raster data as yet. Hopefully there should be raster support soon. Raster layers can be visualised from a local or remote server using geoserver. However having raster layers integrated into a PostGIS data base would be extremely useful for tasks such as overlaying herbarium records with continuous extrapolated climate data or…
Our ongoing work with Conservation International has led to the first regional forest cover change map that has been derived using a single consistent methodology. The details of the study have not yet been published. However as we work on validation and interpretation of the results a pattern has become very clear. Previous deforestation studies…
A very common operation in GIS involves overlaying vector polygons on a raster map and calculating the area of each class in the raster map. The results are then added to the attribute table of the vector map. How can this be achieved in PostGIS? If the raster layer is quite small it could be…
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