Latest Contributions by DavidStrip

‎08-08-2014

I'm trying to export a polygon feature class from a file geodatabase. When I click "export" a dialog window pops up, then another that says script error, then ArcCatalog 10.2.2 crashes. If I try to access the feature class from QGIS, the class isn't even listed. But oddly enough, I can load the feature class into a map in ArcMAP 10.2.2 Any idea what's going on here?

‎07-02-2013

what's the status of this issue? I looked over the current docs and found nothing to indicate that Collector keeps working when it can't connect. Likewise, the sticky post at the top says nothing on this topic. We're many months past the March Dev Summit. Was anything announced (positive or negative) on this issue. I'm more than a little surprised at a design that fails to work in no service zones, but maybe that's because I live in New Mexico where a large fraction of the state has no service and my primary mapping interests are in rural or forested areas.

‎08-04-2012

I want to move the Python27 directory to a different location. How do I tell ArcGIS how to find the new place? Is the distribution from ESRI a strict superset of the standard distribution? ie, as long as I don't have anything in site-packages that I'll miss, can I just throw away my existing Python27 directory that was download from the python site? What is the highest release number within 2.7 that is valid for ArcGIS?

‎03-04-2012

The difficulty of your task depends a lot on how densely the protected area polygons fill the study area polygon. A second factor is whether you are looking to just perturb the protected area polygons or reshuffle them completely within the study area. As already noted, if you can write Python code, you can certainly do the random move and rotation steps - the math is pretty straightforward. However, the packing problem is extremely difficult. If your perturbations are small and the packing density is low, you can just generate a random trial, see if it satisfies the intersection/containment criteria and just throw away the ones that don't meet the rules. You can afford this strategy for sparse cases. Dense cases you'll throw away just about every trial you generate. Overall I'd say you're working on a pretty hard problem.

‎10-23-2011

License type: ArcView Version 10, SP3 Saving to file geodatabase Failure in original message was with 10' contour interval Retried with 100' interval, success after 15 minutes, 17 seconds. Tried with 20' interval - ran for a while, showing progress, then failed at 15 minutes with 9999 error msg and no other info - just "Failed to execute (Contour)"

‎10-23-2011

I'm trying to create a contours layer from an elevation raster. It fails with a 9999 error, followed by (esriDataSourcesRaster:GdalDriver") Failed to copy raster dataset then error 010240 Could not save raster dataset to ...\temp\g_g7634 There is no name conflict in the temp file where it's trying to copy, and there's plenty of disk space. My raster is 16bit x 23,500 x 19,500, or about 1GB. Is that too big?

‎05-15-2011

I just ran into this now. While I think I understand your solution, this seems like an odd behavior for the design of the Field Calculator. I would consider it a bug. Perhaps someone at ESRI can explain the reasoning for this behavior?

‎05-09-2011

Thanks, that was most of what I needed. First, though I had to compute which pixels where >30% slope. I did this with the raster calculator which I eventually found hidden under Map Algebra. I was then able to use the Tabulate Area under Zonal tools to finish the job.

‎05-09-2011

I have a map with about 100 or so polygons in a single layer. (For what it's worth, the extent of the bounding box is about 10,000 sq miles, the area of the polygons is about 3000 sq miles - 30% fill). I also have the DEM for the whole region. I've run slope to compute slope over the region, then used extract by mask to limit the slope map to the region covered by the polygons. That's where I've run out of ideas. I assume the next step is to clip/extract the slope raster to each polygon, but I have no idea how to do that. I see an extract by polygon function, but that requires I input the coordinates of the polygon - it doesn't read them from the layer (and there are over 100 of them). Next up is once I have the slopes clipped to the polygons, how do I compute the percent of the area above some give slope, say 30%? I would prefer not to have to write Python for this, but can if I have to.

‎02-27-2011

If you are going to be computing this a lot and efficiency matters, you can do slightly better by observing that [INDENT]a · b = |a| |b| cos(theta)[/INDENT] where · is the dot product, |a| is the length of a and theta is that angle between vectors a and b. Rearrange and you get [INDENT]theta = arccos((a · b)/(|a| |b|))[/INDENT]

‎07-21-2010

I'm struggling to get my arms about how a geodatabase is used. The example in the help shows a variety of feature classes relevant for mapping a town. These include wells, road centerlines, parcel boundaries, etc. So far, so good. If I'm mapping Smallville, I set up this geodatabase and populate the feature classes. Now I decide to map Gotham. I don't want to just add Gotham data to the Smallville data, do I? Does this mean I have to create another parallel geodatabase with the same structure, or can I somehow create "folders" within the same geodatabase, one to contain Smallville data, and another for Gotham?

‎07-21-2010

actually, you don't have to go to the trouble of using contour list , contour already creates a field with the contour value, so your expression can be performed using plain vanilla contour. But prompted by your comment, I figured out how to set the symbology based on the value of a computed column which is 1 for 100' contours, 0 otherwise. How do you use a formula to pick symbology classes?

‎07-20-2010

USGS topo maps have different line weights for contours at 20' and 100' multiples. I can use the Spatial Analyst contour tool to create contours at 20' intervals and again at 100' intervals and display them at different weights. Is there a way to do this with a single layer by somehow selecting the multiples of 100' and assigning them a different symbology? Alternatively, can I import the layer twice and use a query to select only the 100' multiples? I don't see how to do this? Perhaps I have to compute a new column that is true if it's a multiple of 100' and false if not?

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Date Last Visited	‎11-11-2020 02:23 AM

My Ideas

Latest Contributions by DavidStrip

Exporting feature class from gdb crashes ArcCatalog

Re: Keep Collecting when no Service?

Moving location of the Python27 directory

Re: Randomly moving, and rotating, polygons

Re: Error creating contour - failed to copy raster dataset

Error creating contour - failed to copy raster dataset

Re: Python Field Calculator Null Values

Re: How to compute % area above 30% slope for 100+ polygons in layer

How to compute % area above 30% slope for 100+ polygons in layer

Re: arcpy function to calculate angle between two lines

Re: Geodatabase Design

Re: Creating contour lines of different weights at 20' intervals, 100' intervals

Creating contour lines of different weights at 20' intervals, 100' intervals