Archive for the ‘Data Processing’ Category

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.

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.

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 ?

Rivers & Lakes Connectivity

Monday, November 27th, 2006

Rivers & LakesDon’t know if this can cause a problem for your models: The (not existent) connectivity between rivers and lakes. The rivers are lines, the lakes polygons. Thus, they are considered and treated as two separate layers. So, the computer will probably think that the upstream river ends somewhere (at the beginning of a lake, but that, it does not recognize). And that somewhere else another (but in fact the same) river starts…