Accepted Solutions
Dan is giving good advice with the help page where he is pointing. It is important to know where you are going to draw the lines. The coordinate I used where based on the extent to the featureclass. Enter the properties van the shore lines and look at the Source tab:
It seem to be cut with vertical lines at 156°E (+156) and 180°E (+180). This will be different with each tile of the data. To give some handy tips on constructing the lines I will include the procedure which isn't complicated.
In ArcMap right click on the layer, and select Edit Features, Start Editing
In the standard toolbar there is button to show the Editor toolbar:
...which will show this Editor toolbar. Click on the Create Feature window
In the create features window click on "cd06e" and choose Line in the lower part of the window:
Click on F6 to enter exact coordinate:
Specify the exact coordinates (start point) of the line you are going to draw. For instance Long 180 and Lat 0. Click Enter to confirm the location, which will draw the first point. Hit F6 again and specify the end point of the line:
Enter to confirm the second point and press F2 to end the line.
Repeat the process for the second line, and save your edits:
... and stop editing.
That's all it takes.
As far as I understand you are interested in converting polygons to raster but maintain small islands that will be lost in the translation. To create the polygons (if you have access to an Advanced license) you can do this:
- To avoid loosing islands at the borders of the dataset you good create lines at the border. I created two lines going from latitude 0° to -60°. One at longitude 156° and one at longitude 180°
- Convert this featureclass to polygons using the Features to Polygons tool.
- The Extra lines at the side will close the open polygons:
- Next convert the polygons to raster (I added a field with value = 1) to rasterize on.
- The result shows that many small islands are not represented by pixels (this is normal)
- Rasterize the original lines to raster (without the two side lines)
- This will have pixels for the entire shoreline, but NoData for most of the land
- When you combine the both using for instance cell statistics:
- You will have a raster where land = 1 and all small islands are included
Please note that even very tiny islands will be represented by the value 1 in the output raster, which actually would be incorrect for the chosen cell size.
Dan is giving good advice with the help page where he is pointing. It is important to know where you are going to draw the lines. The coordinate I used where based on the extent to the featureclass. Enter the properties van the shore lines and look at the Source tab:
It seem to be cut with vertical lines at 156°E (+156) and 180°E (+180). This will be different with each tile of the data. To give some handy tips on constructing the lines I will include the procedure which isn't complicated.
In ArcMap right click on the layer, and select Edit Features, Start Editing
In the standard toolbar there is button to show the Editor toolbar:
...which will show this Editor toolbar. Click on the Create Feature window
In the create features window click on "cd06e" and choose Line in the lower part of the window:
Click on F6 to enter exact coordinate:
Specify the exact coordinates (start point) of the line you are going to draw. For instance Long 180 and Lat 0. Click Enter to confirm the location, which will draw the first point. Hit F6 again and specify the end point of the line:
Enter to confirm the second point and press F2 to end the line.
Repeat the process for the second line, and save your edits:
... and stop editing.
That's all it takes.
