All Questions
2,694 questions
1
vote
2
answers
596
views
Using ArcGIS Field Calculator to create classes in new field?
I first classified firstCol into groups and then I want to give the groups with different weighted values in another field, SecondCol. I will need to give different weighted values very often. I find ...
- 141
43
votes
7
answers
39k
views
Choosing File Geodatabase (*.gdb), Personal Geodatabase (*.mdb) or shapefile format?
Previously, I have used geodatabases as an easy way to keep all files together rather than having dozens of shapefiles all over the place, and it is easier when finally exporting all the relevant data ...
40
votes
6
answers
42k
views
Creating square buffer around point feature using ArcMap
I would like to create a square buffer from a point feature but I do not understand the code that goes into it.
Similar questions have been asked on the forums.esri website but that was over 10 ...
- 519
38
votes
21
answers
35k
views
Connecting to PostGIS database from ArcMap for display and query without ArcSDE?
How can I connect to a PostGIS database from ArcMap using ArcGIS Desktop 9.3 and later?
I would like to be able to perform spatially enabled queries and receive the results back (e.g. spatial and non-...
- 9,411
38
votes
14
answers
119k
views
Getting boundary of raster image as polygon in ArcMap
I have a rectangular raster image in ArcMap.
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 quadrilateral which is the ...
- 4,014
35
votes
0
answers
18k
views
How to use PostgreSQL/PostGIS with ArcGIS for Desktop? [duplicate]
Has anyone used PostgreSQL with PostGIS successfully?
I am a semi-experienced ArcGIS user and want to build out a database and connect it to ArcCatalog.
I've scoured the internet for resources but ...
- 451
27
votes
3
answers
5k
views
Packing Polygons within polygon using ArcGIS Desktop?
I have a Boolean raster.
In the grey areas of the raster I would like to fit a given size polygon within a contiguous extent.
Basically, I have an irregular polygon, and i would like to "fit" a ...
- 935
19
votes
7
answers
27k
views
Changing order of features in shapefile [closed]
I have a shapefile and I want to change the order of the features.
Is that possible?
I want to sort the features in the shapefile because I'm embedding this shapefile in a mobile app. The app will ...
- 813
16
votes
4
answers
30k
views
Automated/geoprocesing tool to slice, clip, or cut polygons using polylines using ArcGIS Desktop? [duplicate]
Looking for a simpler method here.
I am trying to split up / cut / slice existing polygons by using existing poly-lines. An example would be splitting a water body or land parcel at the point where a ...
- 221
15
votes
4
answers
26k
views
Manually editing raster to improve classification using ArcGIS Desktop?
I have a land cover classification derived from Landsat TM imagery - I created this classification using ENVI. I would like to edit individual and groups of cells in some areas of the classification ...
- 10.7k
13
votes
2
answers
30k
views
Extracting by Attribute Using ModelBuilder with User Input?
Using ModelBuilder, I want to create a tool that will let a user choose the value or values that will be used to extract a shapefile.
I have a parcel layer with a "Parcel_Type" field. I want the user ...
- 894
11
votes
1
answer
9k
views
Forcing ArcMap to recognize text field in CSV file
Related to Data-type detection in ArcGIS table loading
I have a CSV file which contains a mixture of numeric and text fields:
ID,Txt,Int,Dbl
12345,abc,45,56.78
12346,9,65,23.12
12347,10,66,23.13
...
- 21.2k
11
votes
2
answers
28k
views
Invalid Topology [Topoengine error] from ArcGIS for Desktop?
Using ArcGIS 10.1 for Desktop, I'm trying to run the Identity function on two large data sets but it fails every time. I don't think it is a lack of hardware as I can run other processes on the same ...
- 1,111
10
votes
5
answers
16k
views
Counting overlapping polygons from one Shapefile using ArcGIS Desktop
I have a shapefile with 16,400 polygons. Each polygon shows the expansion of a bird species for the whole world.
Now I have to count the overlapping polygons. I tried it with union and dissolve (...
- 569
10
votes
4
answers
35k
views
Filling NoData gaps in raster using ArcGIS Desktop?
I have a raster with gaps in it. I want to fill these in with averages of surrounding cells using ArcGIS 10.2 for Desktop.
I have tried "Focal Statistics" but it averages EVERY cell and not just the ...
- 101
9
votes
4
answers
23k
views
Extracting one band from three band raster in ArcMap?
I'm fairly new to ArcGIS and I get into trouble extracting a single band layer from a raster image .img in ArcMap that I want to use after in zonal statistics. So far, all help I found is to do the ...
- 103
8
votes
3
answers
4k
views
LiDAR (.las) to bare-earth DEM: average points spacing and cell size?
I am using ArcGIS 10.1 to generate a DEM (bare earth) from LAS dataset. To accomplish this, I use Las Dataset to Raster tool as described in Esri website.
I have read here and there in the web that ...
- 1,546
7
votes
1
answer
15k
views
Adding automated values to attribute field?
I have parcel and buildings layers.
In their attribute tables I want to replace "NULL" values with numbers from 1 to 2000, in "Parcel ID", or "Building ID" field.
How can I do this in ArcGIS ...
- 1,123
3
votes
2
answers
20k
views
Calculate line distances inside of polygons using ArcGIS for Desktop?
I'm working with two data sets:
NHD polyline stream layer for my entire state
HUC Watershed boundary Polygons for the entire state
I am looking for a way to calculate the total length of streams ...
- 157
28
votes
8
answers
88k
views
Extracting coordinates of polygon vertices in ArcMap?
I've got about a dozen polygons in a feature class loaded in ArcMap 10, all in geographic WGS 1984.
How do I easily obtain the coordinates associated with each vertex of each polygon in that feature ...
- 3,195
25
votes
5
answers
45k
views
Finding distance of point along polyline using ArcGIS Desktop?
We need to find the distance of a series of point along a given polyline.
We have a polyline dataset repsenting rivers in a catchment, broken up into river reaches (FID 1 through 35 for example).
We ...
user2040
20
votes
14
answers
47k
views
Reordering fields (permanently) in file geodatabase using ArcGIS Desktop?
Using ArcGIS 10.0, is it possible to reorder the fields in a file geodatabase, and have the order persisted to the database?
We considered exporting to XML, and writing a parser to change the field ...
- 21.2k
20
votes
5
answers
46k
views
Creating point file along line (trail) at regular distances (0.20 miles) using ArcMap
I am using ArcMap 10.1. I have a trail network that I'm trying to establish signs along the trails every 0.20 miles.
Is there a way to create the point file from the line feature?
- 203
18
votes
2
answers
10k
views
Counting and rasterizing polygon overlaps in ArcGIS Desktop?
How do you take a vector layer with overlapping polygons and turn it into a raster where each cell counts the number of polygons containing that cell?
We are looking at polygons of fire burn areas ...
- 181
14
votes
4
answers
14k
views
Using polygons to apply 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, ...
- 397
14
votes
4
answers
22k
views
Digitizing raster automatically? [closed]
I have a raster (.sid extension) file. I want to digitize roads automatically in ArcMap, QGIS, etc. Digitizing by hand would be too time consuming.
How can I do this ?
- 537
14
votes
3
answers
6k
views
How to Create a Grid Inside a Polygon that is Oriented with the Longest Side?
I have been using a process called "Create Polygon Graticule" to create a grid within a polygon with assigned row and column attributes. It is a SAGA tool which I have been running in QGIS. It ...
- 2,324
10
votes
5
answers
11k
views
Displaying dynamic table in Data Driven Pages environment?
I am creating a map series that has many polygons per sheet. There is annotation for the polygons however some polygons are very small with no annotation for them (annotation would completely hide a ...
- 806
9
votes
4
answers
12k
views
Exporting 3GB ArcGIS Raster to KML without losing resolution?
I have a 3GB raster layer, and I'd like to export it to KML for use with Google Earth.
When I use the "Layer to KML" conversion tool in ArcMap, I end up with a low-resolution overlay: looks like one ...
- 193
8
votes
1
answer
11k
views
Creating fishnet grid with specified rotation angle in ArcGIS Desktop?
I'm working on this project and I need a grid with a certain rotation, at about 60 degrees, for example.
Starting from that I need to make a block of 20mx50m, and the last thing is that inside each ...
- 545
6
votes
1
answer
41k
views
Writing conditional (if/then) statements into ArcGIS Field Calculator using Python Parser?
I have gotten stuck on seemingly simple ArcGIS field calculator python expression.
I obtained a great answer to a another similar question a few years ago: Using Range in Python expression of ArcGIS ...
- 2,059
6
votes
3
answers
2k
views
Clustering neighboring points inside ArcGIS Desktop?
I am using ArcGIS Desktop 10x.
I have a shapefile of 300 points which I need to make groups, each of which will contain exactly 9 points which are closest neighbors.
I tried the 'near' tool, which ...
- 785
4
votes
1
answer
1k
views
ArcGis label last vertex Z value
Is it possible to label a feature in ArcMap using geometry values?
In this instance I want to label features (polylines) with the Live Z value of the last vertex obtained from the Shape.
However ...
- 25.7k
3
votes
1
answer
5k
views
Apportioning Neighborhood Information to Census Tracts using ArcGIS Desktop?
I have a shapefile of census tracts and another shapefile of "neighborhoods" with values that I need to have joined to the census tracts. I know I need to apportion the area of the neighborhood ...
- 163
2
votes
3
answers
4k
views
ArcMap fill polygon with points (highest possible number) (Bin Packing Problem: Best Fit)
Is there a tool for ArcMap 10 that fills a given polygon with point geometries?
The points should have a pre-defined distance between themselves, but the points position can vary. Fishnet is not an ...
- 75
1
vote
2
answers
253
views
Zonal statistics 2 ends up causing a fatal error. Is there an alternative?
I have recently switched to using the "zonal statistics as table- 2" supplemental tool instead of the regular "zonal statistics" because I have overlapping polygons which zonal ...
- 35
27
votes
7
answers
12k
views
When Versioning with ArcSDE can posted edits be cancelled or rejected? [closed]
I am using ArcMap 9.3.1 and attempting to work with an ArcSDE geodatabase (with one polygon feature class) that has already been registered as versioned. I'm new to versioning and am still trying to ...
- 451
27
votes
1
answer
7k
views
Calculating Flow Direction and Delineating Basins from Projected vs. Unprojected DEM Data [closed]
This is somewhat of a theoretical question stemming from some discussions with colleagues on the topic of implications with delineating basins with projected (e.g., Albers Equal Area) vs. unprojected (...
- 1,127
22
votes
3
answers
7k
views
Do ArcGIS SpatialReference object factory codes correspond with EPSG numbers?
I've got a project where I'm reading in geometry objects from text files to put them in ArcSDE. These geometry objects have an associated EPSG code, and I'm looking for a way to ensure they're in the ...
- 15.7k
14
votes
4
answers
34k
views
Showing only legend items that are actually displayed on map in ArcGIS Desktop?
Using ArcGIS Desktop, is there a way for the legend, to only show the subitems that are displayed on the map?
- 8,563
14
votes
9
answers
17k
views
Aligning two non-coincident equi-resolution raster grids in ArcGIS Desktop?
I have two rasters: a digital elevation model (DEM) and a Landsat band. The grid resolution of both is 30 m, but the grids are not coincident (see image: the dark raster on top is the DEM; the light ...
- 1,398
13
votes
1
answer
12k
views
Use python to add layers to TOC
I've been battling with adding layers to the TOC for some time now. I have managed to single layers added but need to loop through a folder and add all layers. Shapefiles I cannot get to add at all. ...
- 1,462
13
votes
2
answers
501
views
Minimising number of dynamic pages to map scattered points using ArcGIS Desktop?
From time to time I have to produce mapbook to show points of interest. First step to create pages, using regular mesh:
I don't like the solution because a) there are some pages with single points (e....
- 23.3k
13
votes
4
answers
7k
views
Export ArcGIS tiles data to any image format
I've a raster dataset in Cache/Mixed format in ArcGIS. I need to export this into a georeferenced tiff or any other raster image format in order to use it as base map in some other desktop based GIS ...
- 1,073
12
votes
2
answers
8k
views
Computing UTM Zone from lat/long point
I am trying to convert a latitude/longitude point to UTM.
To define UTM projection, I need to calculate zone for the point.
I am trying to figure out the best way to do this.
One way to do this would ...
- 489
12
votes
4
answers
14k
views
Ordnance Survey grids - download or generate?
Does anyone know a source from which to download vector UK Ordnance Survey grids at varying resolutions? Or failing that, a tool that can create an OS grid at a specified resolution? There are plenty ...
- 1,002
11
votes
5
answers
36k
views
Snapping points to lines in ArcGIS Desktop and automate using VBA?
I use ArcGIS Desktop and I want create a network with a point feature and a line feature. I need my point features to be on the line features so I should do Snap point to line.
However, I do not ...
Nima
11
votes
4
answers
21k
views
Converting/using ArcGIS *.style file for/in QGIS (QML or SLD)?
I have downloaded a dataset from a government organisation. it comes with a .style file.
I use QGIS 1.8 on windows 7.
Is there a way to use the .style file as a qml or sld? I have tried simply ...
- 2,615
11
votes
4
answers
51k
views
Cutting features to do opposite of clipping in ArcGIS Desktop? [duplicate]
What´s the easiest/smartest way of getting the opposite output of the clipping tool?
I just need the area of feature A1 which is not covered by feature A2 in a new Layer/File.
Now, I get the result ...
- 235
10
votes
3
answers
6k
views
Workflow for determining stream gradient?
As far as data goes, I'm working with NHD .shp files, 10m DEMs, and some LIDAR data.
My goal is to determine gradient for 100m segments of a network of streams.
I'm already able to do this, but I ...
- 930