Tagged Questions

2
votes
2answers
33 views

Detecting ring direction of a polygon using ArcPy

I am using ArcPy in ArcGIS 10.1 to process some geometry using the arcpy.da data access module. However I have run into a problem with complex Polygons that contain inner rings/holes. From the ...
2
votes
1answer
92 views

ArcGIS - merge polygons and get combined area

I cannot for the love of god figure out how to combine (join?) two overlapping polygons to determine the combined area they cover in ArcGIS 10. I am sure the Geoprocessing tools can do it, but just ...
4
votes
3answers
245 views

Convert multiple lines into single line

I've no idea if this is basic or what but I have this data that contains multiple lines (forming a polygon shape). I want to convert those lines (multiple - each with a start and end point) to a ...
1
vote
4answers
209 views

Counting road intersections and blocks

I have a shp file that consists of the road system of Mexico City. I would like to count the number of road intersections (crossings) and blocks (which I would define as a segment starting from one ...
1
vote
1answer
105 views

How to convert a shapefile polygon to raster in C#

Does anybody know a way to convert a polygon (vector) in a shapefile to raster data WITHOUT using ArcGIS Explorer Desktop? Is there a way to do this 'progmatically' in C# (WPF with ArcGIS runtime ...
3
votes
1answer
103 views

Polygon to Raster is taking longer in script than in arcmap

I have a large dataset that I am working with. Basically I have a table with 900,000 records that I join to a geodatabase feature layer, then convert that to a raster. This process takes a total of ...
3
votes
1answer
93 views

How to make survey lines within a polygon?

I am trying to figure out how to make survey lines within a polygon. So first I make a polygon. Now I need to fill this polygon with lines, where I can choose the spacing between the lines, and the ...
1
vote
2answers
99 views

Dissolve polygons - group to others with touching corners

I am working with some data that shows land management. There are many places where corners "touch". I would like to dissolve my dataset so that features are grouped (dissolved) with those that they ...
0
votes
2answers
117 views

Adding values to Fishnet Grid?

I have developed a fishnet grid for my study area. I have various datasets for the area and want to allocate a value (from one of the pre-determined datasets) to each polygon within the Fishnet. ...
1
vote
3answers
281 views

How to create one KML per polygon (from one Shapefile)?

I have a shapefile containing hundreds of polygons. I need to create a kml of each of the polygon. Is there any way that I may not have to deal each polygon individually and my polygon file may give ...
6
votes
2answers
72 views

summing up over an area based on a distance related function

Through a field study, we learned that the density of a bird species in the forest was related to the distance to forest edge: ln(density) = 1.89*(distance to edge) + 0.34 Now, for any forest ...
3
votes
3answers
153 views

How do I sort polygons by their latitude?

We have a set of polygons which we would like to sort and number according to their latitude. This will make it easier for local authorities to relate to the numbers of the objects. I have looked ...
5
votes
2answers
293 views

How to combine data from overlapping polygons?

Here's what I'm working with: Shape file of the current 32 Congressional districts for all states Shape file of the tract boundaries for Texas A DBF format table of Hispanic counts and proportions ...
6
votes
3answers
234 views

What geometric attributes do polygons possess, and how can these be used to filter features?

Given a polygon featureclass containing many polygons of different sizes and shapes, which geometric attributes (area, perimeter, etc) could be used to filter the polygons? It's probably best to ask ...
3
votes
2answers
229 views

How to convert polygon layer to txt files?

Is there any way to convert polygons that do not have coordinates in the attribute table to a txt file with coordinates. I will be using the txt file in a different software (not ArcGIS), so I need ...
5
votes
3answers
453 views

How do I use polygons to apply a unique value to all raster cells within those polygons?

In ArcGIS 9.3, I have a raster file that I would like to "mask" with polygons, giving a single value to all the raster cells that overlap the polygons. How can I do this? Here's a screen shot, where ...
1
vote
1answer
177 views

Is it possible to have self intersecting polygons in GML or shapefile?

GIS vector data for example GML or shapefile contains polygonal data. Lets assume, we have polygon A which has self-intersection which means that the edges in this polygon intersect with each other. ...
3
votes
1answer
151 views

ESRI/ArcGIS draw protractor

I am using ArcGIS maps and trying to follow JS API. I am trying to understand how can I add a protractor on the map which will help in angles while drawing polygons. I understand I could add a Feature ...
0
votes
1answer
582 views

How to divide polygon layer into multiple layers by values in attribute table column in ArcGIS 10.1

I have polygon layer with multiple types of area (forest, grass, and many more), and I´d like to divide this layer into many layers by the area type. I´ve tried Split function but I receive an error ...
1
vote
1answer
105 views

Summarize polygon area using another polygon

I have a shapefile representing public/private lands in Montana. This is a multipart shapefile where I've simplified attributes so that #1==private and #0==public. Next I have a shapefile of ...
7
votes
1answer
436 views

Advanced Polygon and Parcel Splitting

While I am still struggling to divide polygons into same sizes in ArcGIS (we are using ArcView 3.0 scripts now which work fine), I now have an even much more complicated problem: I would like to ...
2
votes
1answer
573 views

Create polygon based on the spatial extent in arcgis

Is there anyway that I can input 1) The Coordinates System (projected is OK) 2) The boundingbox and create a rectangle polygon based on these?
5
votes
1answer
134 views

How can I increase performance on inserting features with polygon geometry?

I have a problem when inserting features with polygon feature class in FGDB. This is my code: ... initialising some fields (does not affect performance) m_featureBuffer.Shape = ...
5
votes
3answers
745 views

How to interpolate into polygons?

I need to interpolate values from points to polygons. I have a point shapefile and a shapefile of adjacent polygons. Some polygons get several points falling inside, some have nothing. I thought ...
1
vote
0answers
141 views

how to automate changing polygon's shape while keeping its area the same and limiting deviation from orginal centroid? [closed]

I have a polygon that was digitized based upon visually interpreting underlying values of rasters/vectors that represent a natural environment (soil type, surface roughness, slope, elevation, ...
1
vote
1answer
106 views

What is the Quickest Way to Update Polygon Geometries in ArcGIS

I have a shapefile which contains the approximate boundaries for sites that are being worked on (thousands) in polygons, each with a reference number and additional detail in the attribution. I have ...
2
votes
1answer
501 views

Convert shapefile in NAD27 from meters to decimal degrees to match xy data?

I have a shapefile of a boundary (polygon) that has the following projection: NAD_1927_UTM_Zone_11N Projection: Transverse_Mercator False_Easting: 500000.00000000 False_Northing: ...
6
votes
1answer
162 views

Can you permanently set the polygon/polyline segment length?

I'm trying to create a several hundred polygons in ArcGIS 10, each of which may have up to several hundred vertices. For consistency sake I would like each line segment in these polygons to be of a ...
3
votes
2answers
179 views

How to select polygon features that have their centers outside of another polygon feature class

Since I only have Incorporated area feature class, how can I select census blocks that are in unincorporated area? Or not within any incorporated areas? Thank you. John
4
votes
1answer
458 views

finding the long axis of an irregular polygon

Hi need some help in how to find the long axis of an irregular shaped ellipse using ArcGIS. I have found the centroid but don't know how to determine the longest distance.
0
votes
2answers
708 views

Calculating shape perimeter/area per zone in ArcGis 10

How can I calculate geometrical features of polygon (perimeter and area) per zone (similar to zonal stats for rasters)? I have a square fishnet (approx 20x35, 1 square kilometer each) and I need to ...
1
vote
2answers
215 views

Clip raster to multi raster

I have a raster aerial photo. I have county wide parcel data. I want to clip/screen shot the raster at each individual parcel. Think of this application - a post card with an image of your house ...
3
votes
1answer
600 views

Changing the scale (generalisation) in ArcGIS 10

I have 2 polygon layers, accordingly 1:10 000 and 1:500 000. I want to generalize the first layer from 1:10 000 to 1:500 000. I tried using Simplify polygon tool, and since these scales relate to ...
4
votes
2answers
1k views

Removing sliver polygons, ArcGIS 10

I unioned 2 layers into 1 layer, and it created sliver polygons. I used the elimination tool to merge them with neighboring polygons. As as result, it merges all sliver polygons to only one polygon ...
1
vote
2answers
214 views

Label inside top left corner of polygons

Does anyone know of a tool or procedure to automatically place a label in the corner of a polygon, rather than at the centroid? I am using Mapinfo and know that I can manually place the label ...
4
votes
3answers
659 views

How to Clip a Vector File based on certain Raster Values?

I need to clip a vector file based on certain values of a raster (Slope > 2%). I can´t find a direct way to do it. Trying to vectorize the raster first didn´t work. Is there any tool (ArcGIS or ...
7
votes
5answers
5k views

Get boundary of raster image as polygon in ArcGIS 10

I have a rectangular raster image in ArcGIS. My question is: how can I produce a polygon which is just the extent of the raster image? That is, I want to have a polygon layer with a single ...
0
votes
1answer
187 views

One large polygon or many little ones. What is better regarding performance?

I´m designing a geoprocessing service on ArcGIS Server using several nationwide datasets. Currently I´m preparing some of the datasets and I´m wondering if I should dissolve my polygon layers ...
0
votes
0answers
436 views

Removing small polygons in ArcGIS 10 using Remove small polygon extension by Gonza2

Halo friends, any body has experiences working with Remove small polygons from a feature class script tool by Gonza2 in ArcGIS 10? The extension works perfectly in previous version of ArcGIS 9.3.1. ...
2
votes
1answer
165 views

Best Method for Validating polygons?

I would like to assess the spatial accuracy of a load of polygon shapefiles which are supposed to show air quality for a bunch of countries. Firstly I want to assess whether each shapefile has a ...
16
votes
3answers
2k views

How can I calculate the average width of a polygon?

I'm interested in examining the average width of a polygon that represents the road surface. I also have the road centerline as a vector (which is sometimes not exactly in the center). In this example ...
3
votes
1answer
258 views

ArcGIS SOAP Web Service - Determine if a Polygon Contains Negative Space

I am running queries against a polygon layer using the ArcGIS SOAP Web Service. A user selects a point within that layer and the resulting feature set contains PolygonN objects. Occasionally, the ...
5
votes
1answer
1k views

How to calculate polygon area considering slopes?

I am looking for an accurate algorithm or a service to calculate surface area on earth where points are calculated on the basis of GPS Coordinates. I am using Google Map Api version 3 and are drawing ...
11
votes
4answers
787 views

ArcGIS - How do I group corner-touching contiguous polygons?

Using ArcGIS 10, I have a Feature Class which I converted from a Raster (GRID) (Raster To Polygon Tool). There are approx. 180,000 polygons. The attribute table contains a [grid_code] field which ...
2
votes
1answer
1k views

Create point in intersections of two layers

I have two layers. One of them is 'Road_line' and another one is 'forest_shape'. I want to create a point layer that has points in intersection of that layers. I couldn't find any tools for it. Could ...
3
votes
1answer
1k views

Export query to identify what polygon certain points fall in

I'm using Arc GIS 10. I have shapefiles consisting of points (street addresses). I also have shapefiles consisting of polygons (ie, congressional districts, city council districts, etc... a separate ...
6
votes
4answers
458 views

Exporting polygon features to individual image pngs

I have a shapefile with a few thousand polygons, ArcGIS [9.3] (and even PostGIS). I would like to export each of those polygons into its own thumbnail image file without any real context. What is the ...
5
votes
2answers
726 views

Finding parcel polygon features with frontage on multiple streets

The Department of Public Works would like to know how many properties in the city have a sidewalk at both the front and back. To get at this, I'm looking for a method to find parcels with frontage on ...
6
votes
1answer
754 views

How to eliminate gaps in the ArcGIS union operation?

I have a layer that has nested polygons in them. I want to aggregate the polygons. I do this using the Union function. I use the "No Gaps" option when I perform the union. However, when I overlay ...
4
votes
3answers
2k views

Filling in Donut Polygons in ArcGIS

I'm new to GIS, so please forgive my bad usage of terminology. I have a set of polygons that represent bodies of water. In the same feature are polygons that are the islands in the body of water. ...

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