Latest Contributions by JessicaBarnabei

I have built the attached model to run individual viewsheds for each tower location.  Each output is labeled with its unique identifier (Dist_ID) using the %Value% inline variable. I used a mask of the 15 mile buffers in the Viewshed Environment settings to cut the processing time and output down to what I wanted.  Then I extracted just the "visible" (1) pixels and created a polygon from it.  This created tons of little pieces per site, so I had to use dissolve to get them all into one polygon. Then I collected them and merged them at the end.  So this works great and all.....BUT here is the problem.  I need to tie these viewsheds back to their original information so that I can see which viewshed goes with a particular tower.  I can't do a spatial join because some of them overlap and the join may connect the wrong point.  I tried clicking on the Fields environment toggle hoping it would carry over some info, but it didn't.  The ID that I need to connect to my original data is in output names using the %Value%.....but that gets lost after I collect and merge.  Is there something in the environments or some toggle I'm missing that will carry over the values from my unique ID field?  My ultimate goal is to eventually Union these tower viewshed polys with demographic block groups and get an idea of the % of the population that lives within each individual tower area. ... View more

I am trying to transform precipitation data I got from NOAA from HRAP into Albers Equal Area Conic (USGS).  It is an older file (2005) data that is in a point file (grid).  Each point represents the total rainfall (inches) for 2005 for that location. Derived using these methods: http://water.weather.gov/precip/about.php.  There are no transformations available for HRAP.  I even checked the extensive list here to make sure: http://downloads2.esri.com/support/TechArticles/Geographic_Transformations_10.1.pdf I found this about reprojecting it here: http://www.nws.noaa.gov/oh/hrl/distmodel/hrap.htm But this requires an XMRG file, which was not sent to me.  I am ultimately trying to take the precipitation data and get an Average Yearly Rainfall of each County that the points fall in using a spatial join and the average summary. (or even using Zonal Statistics with the Counties as the zones) So the question is....If HRAP doesn't have a Transformation, is there a way to do it without an XMRG?  And if not, do you think its safe to just ignore the Geographic Coordinate System Transformation warning and let ArcGIS do it's best on the fly?  Since this is an average, would it really be that off if I didn't do any transformation?  I just want to make sure I'm understanding all of this correctly since I've never worked with hydrologic data before. Thanks! ... View more

My boss has tasked me to take the gridded 2000 Census data, found here: http://sedac.ciesin.columbia.edu/data/set/usgrid-summary-file3-2000  and he wants a lat/long of each point along with its value, and it exported out to a dbf or csv eventually.  He doesn't use ArcGIS......he is an excel guru and loves to analyze statistics through that.  So the way this is broken down is that each attribute of the census has its own file.  You can download it in GeoTiff or ASCII.  Each file is on the same grid, but I see no unique grid cell ID.  Must be internal?  I tried GeoTiff first.  I thought I could use the Raster to Point tool to create points with which to extract data by, but it does not convert the NoData Cells to point.  And since this is grid that I want to reference multiple attributes to the same grid cell, that won't work. I tried downloading the ASCII file, next hoping it would have data visible that the GeoTiff did not.  I viewed it notepad but I doesn't seem to have what I need either, but I'm not sure that I'm viewing it correctly or if I need to calculate anything.  Any help is greatly appreciated. The goal is to eventually do the same thing for the gridded 2010 Census data when it comes out later in 2014.  Then have some comparison.  I checked into doing this myself and asked the person at SEDAC how long he thought it might take.  He said 3 months just for one census year and that was running a cluster of super computers. Yikes! I'll wait! I'm using ArcMap 10.1 with all the extensions such as Spatial Analyst and Geostatistical Analyst.  Service Pack 1. ... View more