Latest Contributions by MarkBoucher

Arc Hydro process my floating point DEM just fine and has for years. Why are you converting it to integer? Mark Arc Hydro Problem Solvers Thread ... View more

Are you trying to relate the two or are you trying to correct the red line so it follows where the green line is? (refering to the desirable_result.zip�?? file you posted earlier) ... View more

I meant single-part to multi-part. See this link. It might help. I don't have time to test this. http://forums.arcgis.com/threads/8942-singlepart-to-multipart ... View more

How about single-part to multi-part? ... View more

The "Reshape Feature Tool" will let you change a selected polygon starting from anywhere. You select on the polygon you want to modify, click on the edge or vertex you want to start editing at, and reshape it. You have to close the reshape on the original polygon. This is probably as close to what you want as I can find. This will keep the attributes you may have entered for the polygon previously. Add one vertex at a time. Select and then double click the polygon. The where you want to add a vertex, right click. I think you have to do this for ever new vertex you add. I just discovered the "Replace" function. If I draw a polygon and finish it and then click the palet to start another polygon, select and right click on the existing polygon, there is an option to "Replace". This appears to do what you want, but two thing happen that you might not like. (1) The editing starts at the first vertex, not the last; and (2) it creates a new feature, it doesn't simply modify the first one. I'm not sure what happens to the attributes you may have entered for the polygon previously. ... View more

If I need to add onto a feature, I often will start a new one and when I'm done, I'll close the new, select it and the one I want to add it to and use the Edit>Merge tool to make them one feature  I use the "V" key to reveal the vertices and the snap options to make sure the added feature snaps to the last vertices in the previous feature. ... View more

Try suggestions from here: http://forums.arcgis.com/threads/48100-ArcHydro-Problem-Solvers The first things I'd try are clearing out the temp files and turning off the background processing. Also, I assume you are working with data on you laptop and not on a network. Working locally eliminate errors for some reason. Lastly, I'm not working with 10.1 and so there could be something else going on related to the operating system. ... View more

This might help answer your question. http://forums.arcgis.com/threads/71389-ArcHydro-vs-HEC-GeoHMS ... View more

Any help on this out there? ... View more

Make sure your geographic extent includes the extents the points are in. Menu: Geoprocessing>Environments>Processing Extents ... View more

Try importing the shape file into a geodatabase and see if that make a difference. ... View more

If you import the shape file into a geodatabase it will create an Object ID for you. That would get you around that part of the problem. ... View more

See: http://forums.arcgis.com/threads/68360-Error-in-DEM-Reconditioning-in-Arc-hydro-10?daysprune=365 It could be your agree stream layer does not have an Object ID. Put it in a geodatabase. This will give the features an object ID. ... View more

Let's see... One way that flows are "interpolated" is by area. So if you know the flow at two locations, the flow at any point between them could be approximated by using the area. Plot area on x-axis and flow on y-axis; any area on the creek between those two could be approximated by linear interpolation. Arc Hydro provides a flow accumulation (fac) grid which is the count of cells that flow to it. It could be used to approximate the area that flows to that grid. I believe it is an integer raster so you would get a truncated integer for the area if you multiplied the the fac by the area of the each grid. Therefore, you can approximate the drainage area for any point in the flow accumulation grid and therefore the area at the two points where you know the flow and every point in between. Seems like a place to start... ... View more

If your ultimate goal is to make a series of maps, one for each of the 40 districts, you could look into Data Driven Pages. This allows you to make a "book" of maps with the same symbology from a single feature class of multiple features. I do this for watersheds feature classes. http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Using_Page_Definition_Queries/00sr00000004000000/ ... View more