Archive for December, 2006

Differences in Continental Shelf

Friday, December 29th, 2006

Differences ShelfI have found, and finally managed to extract, data from a different source for the calculation of the Continental Shelf. It’s much more accurate – not only in terms of resolution but also in terms of exactness. Have a closer look by clicking on this image. The green is the “old” shelf, the blue, dotted, slightly transparent one is the “new” shelf. I guess that for the model it’s not of utmost importance to be that exact…. But let me know!

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.

Zonal Breakdown with Area

Wednesday, December 27th, 2006

MollweideHere is the Zonal Breakdown Shapefile in Mollweide Projection (“equal area”), with a field for the area (in km2 and m2). Version as of 27-12-2006.

Mollweide Projection

Wednesday, December 27th, 2006

Mollweide ProjectionThis is the correct projection of Mollweide.

Zonal Breakdown

Tuesday, December 26th, 2006

BoxesOk, here is a completed version (Version as of 26-12-2006), which aggregates the ocean, shelf and continental 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.

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 ?


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′