Latest Contributions by EricRice

If you want a polygon, you can create a polygon using IConstructGeodetic. http://help.arcgis.com/en/sdk/10.0/arcobjects_net/conceptualhelp/index.html#//000100000m74000000 If continuing down the current path, you can't fill inside a closed polyline.  It must be polygon to have area. Regards, Eric ... View more

Greetings, You need to have a look at the IConstructGeodetic Interface. Eric ... View more

Thanks for pointing that out.  Obviously I didn't quite think that response through all the way. 😮 Eric ... View more

David, What are the properties of the input image?  Number of bands, bit depth, etc... What format are you selecting for output?  Does the input have RPC information? Fundamentals of orthorectifying a raster dataset Regards, Eric ... View more

INT truncates no matter what you add.  4.2 and 4.9 would both become 4.  If you need to round, see Round Up or Round Down tools. Regards, Eric ... View more

This thread seems relevant to your question. http://forums.arcgis.com/threads/5827-Raster-to-KML-problem Regards, Eric ... View more

Juliane I don't think your data is likely to be integer and hence have an attribute table which is required for Extract by Attribute.  If I'm wrong you could definetly do that though.  For the most part, land masses don't go below sea level.  Sometimes they do though....If your area has all positive values for land and negative for bathymetry you could do a Con statement to get everything less than 0. If you want to do the water feature, you need to create it by using the editing tools. Since you have the land mask already, the Mask button from the Image Analysis Window is your best bet, or the Inside/Outside options in Data > Export data.  (see blog)  If you don't have ArcGIS 10, there is no way to do masking like this; where you get rid of what is under the mask.  Set Null (not a traditional clip tool) may be an alternative where you could set the land pixels to nodata and keep the bathymetry though.  Pre 10, you could only clip and retain what is under the polygon.  If you aren't on 10, you need to manually edit the water boundary in polygon form and use that polygon to clip out the data you want. Let me know your version and I can make some recommendations for earlier versions if needed. Because of this thread and many others, we just posted a blog about the various ways to clip and mask in ArcGIS.  It's not long, but probably worth reading. Cliping an image or raster in ArcGIS. Regards, Eric ... View more

Jerry, Please run the Path Distance tool with your input stream as the feature source, and your DEM as the Surface Raster.  Do not use a cost raster.  Without  a cost associated you basically get the surface distance from each cell to the nearest source.  Then just reclassify, use con statements, use the classfied render with specific class breaks (multi-ring buffer type look), and keep it in raster form or convert specific classes to polygons if you really needed a polygon buffer. Regards, Eric ... View more

Example (Raster A - Raster B) Raster A Min 5 Max 10 Raster B Min 1 Max 10 The Min value of A is larger than that of B, per your criteria. Lets say at a given pixel location, Raster A is value of 6, and Raster B is value of 10. This would result in a value of -4.  It doesn't matter what the minimum values are.  It matters what the values are at the pixel locations being subtracted. Regards, Eric ... View more

Anna, The determining factor is whether or not the cell center falls within the polygon (mask).  It has nothing to do with percentages.  You can verify this by converting your resulting raster to points.  You won't see any points outside the polygon. When you perform the extraction I would encourage you to set the Snap Raster in the Environment Settings back to the original raster you were clipping.  If not, your output will be shifted from the original pixels. Internally, we convert the polygon mask to a raster then use that raster to do the extraction.  If you are truly concerned about the area (percentage of area), you can convert your polygon to a raster in advance of the extraction.  When you do this, make sure you run the Polygon to Raster tool with the Cell Assignment Type parameter set to Maximum Area.  Then use the resulting raster as the mask.  When we convert your polygon input to raster behind the scenes we are using Polygon to Raster - expect we use the defaults which is Cell Center. Hope that helps explain how it works. Regards, Eric ... View more

Greetings, The first thing to come to mind was why do want to remove the pixels that overlap?  In any case you have multiple options depending what you plan on doing.  First (I think the most tedious) you can create polygons to define the area of the raster you want to keep, then use the polygon to clip the raster(s), essentially creating perfectly tiled raster datasets.  This requires manually editing features... Optionally, you could mosaic the data together, then use the Split Raster tool to create the tiles. This doesn't require feature editing. I personally would either mosaic the rasters together and choose an appropriate mosaic operator, like min, max, or mean, or I would put the elevation data in a mosiac dataset, thus preserving the original values in the data, but mosaicking on the fly (still using an appropriate mosaic operator). You may find this 3 part series interesting. Managing elevation data: Part 1: About elevation data Managing elevation data: Part 2: Design and data management plan Managing elevation data: Part 3: Workflow steps ... View more

Juliane, One more way, if you don't want to take the time to build the water polygon or don't already have one...  You must have ArcGIS 10.0 minimum so you can access the Image Analysis Window.  There is a mask function button on the window that performs the type of masking your looking for.  i.e. Keep what is outside the mask.  See Using the Mask button on the Image Analysis window Terminology differences: Clip GP tool  - performs clip.  Keeps what is inside the polygon Extract by Mask GP tool - peforms clip. Keeps what is inside the polygon Clip Function (Image Analysis Window) - performs clip. Keeps what is inside the polygon Mask Function (Image Analysis Window) - performs mask. Deletes what is inside the polygon. Regards, Eric ... View more

Greetings, What exactly do you mean .adf raster?  It's probably an Esri GRID without looking at it.  GRID's are made up of many .adf files in folder structure like that of a coverage.  Esri TINs are also made up of multiple .adf files.  Do you have an Info folder associated with this raster?  A screenshot of the workspace where the raster resides would be helpful.  If you can see your data (.adf) in ArcMap you should be able to just run Copy Raster and create a Tiff file. Regards, Eric ... View more

Greetings, It sounds like you are interested in Zonal Histogram. Eric ... View more

Greetings, A quick way to go about this is to run Raster to Multipoint (or Raster to Point), then run Point to Raster using the Sum option for Cell Assignment Type, and setting your output cellsize to be 500.  Be sure to set your snap raster to your original raster when running Point to Raster. Regards, Eric ... View more