Total area of ArcGIS Intersect output is NOT equal to the smaller input?


I have two polygon inputs that share the same projected coordinate system – one is land cover data, the second is parcel data (of smaller total area). When I execute a standard geoprocessing Intersect, and then recalculate the geometry of the Output’s polygons, the resulting total area of the Output polygons is not equal to the total area of parcel data total area (Output is ~200 acres < the parcel data input). I might anticipate slivers in the original land cover data, but the Output shows that all area is classifiable (no null Land Cover classes). Is this a normal occurrence? Or is there something I can/should do to get these areas to match exactly?

Also, not sure if order matters, but I listed the Land Cover data first, and the Parcel Data second, when adding Intersect inputs.

I’m using ArcGIS 10.x for Desktop.

How to obtain data to create average precipitation in 2012?


I am currently doing a final project, which I have to create a map of 2012 average precipitation of lower 48 states by using natural neighbour interpolation. The problem is that how can I get the data? I already have the data of 2012 from NOAA website in .CSV format. There are more than 80000 geographical locations in the file (http://www1.ncdc.noaa.gov/pub/orders/cdo/434898.csv) Would it be possible for me to use them to create the map and if anyone has any idea for
me about getting a data please help.

Clipping MrSID files in ArcGIS Desktop?


Does anyone have experience subsetting/clipping a large NAIP imagery file in MrSID format? Some of the NAIP files we have are by county and they have really large file sizes.

The files are from the FSA NAIP Imagery.

How does it work if you subset a MrSID file? Does ArcGIS has to uncompress it first before it can proceed to clip or subset an area of interest?

ArcGIS Linear referencing tools duplicating records and erroneous measures


I am using LocateFeaturesAlongRoutes_lr, MakeRouteEventLayer_lr, and MakeRouteEventLayer_lr to combine three different overlays into one based on this question I asked month ago. The code is as follow:

try:    
    print "ntttLocating features along roads",
    arcpy.LocateFeaturesAlongRoutes_lr(FTR_TO_RS_TEMP, ORIG_RD_FTR,
                                       "CONTROL_SE", "0 Meters",
                                       FTR_TO_RS_DB_TEMP,
                                       "RCSKEY LINE FMEAS TMEAS", "FIRST",
                                       "DISTANCE", "ZERO", "FIELDS",
                                       "M_DIRECTON")

    print "ttt[OK]nttcombining features and PDT schedule",
    arcpy.OverlayRouteEvents_lr(FTR_TO_RS_DB_TEMP,
                                "RCSKEY LINE FMEAS TMEAS",
                                LP_SCHEDULE, "RCSKEY LINE START END",
                                "UNION", ROAD_LP_JOINED_TEMP,
                                "RCSKEY LINE FMEAS2 TMEAS2",
                                "NO_ZERO", "FIELDS", "INDEX")

    print "ttt[OK]ntttNew event route layer",
    arcpy.MakeRouteEventLayer_lr(ORIG_RD_FTR, "CONTROL_SE",
                                 ROAD_LP_JOINED_TEMP,
                                 "RCSKEY LINE FMEAS2 TMEAS2",
                                 LP_EVENT_LAYER_TEMP)

except Exception, e:
    tb = sys.exc_info()[2]
    print "Line %i" % tb.tb_lineno
    print e.message

For some reason, the routine is causing the following two issues:

  1. Duplicate records of overlayed route events. For example, when ArcGIS creates a new record based on a union of two others, it would duplicate it 5 to 10 times.
  2. New fmeas and tmeas that are -0.000023 to 0 and 0 to 2.999977 instead of 0 to 3 as in the original layers

I am quiet certain that the two issues are related and was wondering if anyone can shed a light

InfoWindows in Nested Polygons (Google Maps Api 3)


I have a large polygon with thick borders inside which there are several smaller polygons something like multiple city polygons inside a state border. The problem with this is that the info-windows for some of the polygons don’t show up when i click the polygon.(i have set up a click listener for each smaller polygon)

Toolvalidator script is not working in ArcGIS Server


I have made a small GP tool in ArcMap, which is also having some validation code in tool validator class. And it is working fine as GP tool in ArcGIS desktop(Arcmap). But when i published the same tool as Geo-Processing service added as toolbox in ArcMap, it is not considering any validations.
Ex: Disable/Enable some textboxes.

What should i do to integrate these validations in GP service also?

web based GIS geoprocessing vs desktop based GIS geoprocessing [closed]


difference between the WEB and DESKTOP GIS geoprocessing (buffer)

  • what is the main difference in the area of processing speed or retrival speed of output
  • take in case of contour generation from DEM , what should I prefer in this case desktop or web based gis (in terms of time taken to complete task ,processing speed etc)

Point Distance analysis tool in ESRI ArcMap is not calculating all observations


I’m grading homework for a number of students who are doing the same GIS assignments, and in the latest one, three of them had answers that varied from the rest of us when I looked at their statistics in the point distance table. 28 observations should have been recorded, but each of them only had 18, 19 and 20 observations recorded respectively, throwing their averages off. I can’t find an answer online.

Any input?

how to create a multipoint geometry in arcgis using python and arcPy library


I have specific points and I need to create multipoint geometries, in a model-builder python script, following an equation that provides me the new (x,y) points around my initial point. Is there any way that you provide a function that produces Multipoints ?

Is the MakeFeatureLayer temporary location the same as “in_memory”? [duplicate]


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