Archive for the ‘Themes’ Category

Cultivation Intensity

Friday, January 12th, 2007

MatthewsDifficult to find any raster data set about “Land Use Intensity” or “Agricultural Intensity”. It seems the only existing one is Matthews Cultivation Intensity data set from 1984.

The Matthews Vegetation data set comes from a global map of vegetation types, which was compiled from up to 100 existing map sources at the Goddard Institute of Space Studies (GISS), Columbia University, in New York. It shows the predominant vegetation type (one out of 32 classes) within each one degree-square latitude/longitude grid cell. Matthews Cultivation Intensity data set is based on existing maps of vegetation and satellite imagery, and it shows the percentage of each one-degree square latitude/longitude grid cell that is under cultivation, versus the percentage of natural vegetation, including five classes.

Let me know if you are interested in it.

Coastal Water and Coastline

Wednesday, January 10th, 2007

Coastal WatersCoastal WatersOk, the problem with the gaps between the coastline and the coastal waters has been solved. Here is the shapefile which fits smoothly with the country template or the coastline file.

Total Animal Density

Monday, January 8th, 2007

All AnimalsThis is the aggregated layer of total animals, summing all others like buffalos, cattle, pigs etc. up into one layer. Download here.

Source: FAO
Year: 2005
Resolution: 5?¢â??Ã?¨¬?

GEBCO – Bathymetry

Monday, January 1st, 2007

GebcoGebco – General Bathymetric Chart of the Oceans – offers a finer resolution of the bathymetry as the Etopo2 at 1-minute. Here is the GRID-download.

Source: GEBCO/NASA
Date: 2003
Resolution: 1 minute

Mean Depth of Coastal Waters

Thursday, December 28th, 2006

Mean DepthHere is the table which shows the mean (as well as other statistical parameters) depth for the Coastal Water Zones.

Coastal Waters

Thursday, December 14th, 2006

ShelfDon’t know if this causes trouble for your calculations or if the calculation gets too inexact: Due to the pixel-based origin of the coastal waters data set, there are “empty cells” close to the coastline… Just so you are aware of it…

Coastal Water

Wednesday, December 13th, 2006

not that simple, the question about coastal water/zones… Most definitions define it to be somewhere between 100-200m, see here.

Histogram
Here is a histogram showing the distribution of the bathymetry; indeed, I would say there is a rather sharp break at -200m…

So, do we go for an “average” of -150m (Wikipedia) or of the “extreme” of -200m ?

GRIDs

Wednesday, December 13th, 2006

GRIDsHere a the GRIDs… 2.5×2 Degrees as polygon shapefile or as raster.

Attention: ArcGIS is able to read and display raster datasets with non-square cells. This includes the ESRI GRID format as well. However, in most cases ArcGIS prevents ESRI GRIDs from having non-square cells by default. For example, the Spatial Analyst extension is based on square cell analysis. This means all output data created from Spatial Analyst will have cells that are resampled to square cells.

Annual Precipitation

Friday, December 8th, 2006

PrecipitationDownload the data set here.Source: WWDR
Date: 2000
Resolution: 30′

Annual Evapotranspiration

Friday, December 8th, 2006

EvapotranspirationDownload the data set here.Source: WWDR
Date: 2000
Resolution: 30′