ArcMap is the main component of the ESRI ArcGIS suite of geospatial processing programs.
7
votes
4answers
8k views
Extract coordinates of polygon vertices in ArcMap 10?
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 ...
7
votes
3answers
4k views
Dissolve not working in ArcGIS 10
The dissolve tool is not working for me when I use ArcGIS 10. It works perfectly when I use version 9.3. Any help?
7
votes
4answers
8k views
How to find the distance of a point along a polyline?
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 ...
7
votes
4answers
3k views
How can I export raster data from Arcmap to an R *.grd file format?
I want to work with raster data in R, but I have problems exporting my raster dataset from ArcMap. By "export data"/GRID I get a file with an *.aux extension. What I need is *.grd.
Can anybody help ...
7
votes
3answers
393 views
Method to generate points in any projection
I am writing an application in ArcMap to generate a grid of points. These points have a very defined layout and I have worked out an algorithm that works great under a projected coordinate system. ...
7
votes
2answers
253 views
How to determine projection parameters when customizing a projection
I am trying to customize an Albers and a Hotine Oblique Mercator (HOM) projection to minimuze distortion in the region I am analyzing. The region extends from about 51 to 62 degrees latitude, covering ...
7
votes
1answer
490 views
How can I auto-increment output file-names in Toolbox ESRI ArcMap 10
I have a simple tool which outputs a file. I would like the filename to be a number which increments every time the tool is run.
How would I go about implementing this using the toolbox in ESRI ...
7
votes
2answers
359 views
Locked/Uneditable Map Document
I am wondering if its possible to create a locked map document?
I have a document that multiple users will be accessing and as a way of preventing them from making any accidental errors, am wondering ...
7
votes
3answers
2k views
ArcObjects (ArcGIS for Desktop and C#): How to cast between the ArcMap COM UI and my custom .Net UserControl objects?
I'm creating a utility to run in ArcGIS for Desktop using ArcObjects (9.3.1 SDK) and C#.Net. My prototype involves a toolbar with two comboboxes and a tool. The first combo selects a layer in the TOC, ...
7
votes
1answer
473 views
Label legend interval with number of elements - ArcMap 10
I have made a series of choropleth maps in ArcMap 10.
When I classify the interval the bottom of the dialogue tells how many elements are in the class.
Is it possible to have this number ...
7
votes
3answers
805 views
Use buffer tool to draw different radii?
I am new to Arcmap-Arceditor 10 and could really use your help. I have been mapping ethanol plants (which utilize corn to produce ethanol) and corn production amounts in the counties of the USA.
...
7
votes
1answer
123 views
Merging Issues doubling up
I have two shapefiles with some of the parcels (surveying) overlapping each other. How do you get those overlapping parcels from doubling up? Is there a way you can have it dissolved or union etc... ...
7
votes
4answers
99 views
How do you programmatically read the coordinate display format in ArcMap?
I'm looking for a property (or properties) that will give me the display units and the formatting.
I assume I need IMap.DistanceUnits but I can't find the formatting. Is this exposed?
I am also ...
7
votes
1answer
795 views
Edit End Points in Polyline (Python/ArcMap10)
I am trying to make a polyline endpoint snapping tool in python. using a Search Cursor I read in the values to an array of line objects (which contain the feature id of the line, and two "EndPoint" ...
7
votes
2answers
550 views
Select by Attributes based on SQL wildcard range
I want to select all the records from a geodatabase table where the string starts with a letter, so I tried
SELECT *
FROM tbl_names
WHERE "name" LIKE '[A-Z]%'
This returned no records. After some ...
7
votes
1answer
674 views
How do I get the current Undo and Redo item in ArcMap Operation Stack?
I just posted this on ESRI forum and found this link so I am trying it here too:
Research ArcGIS Resource Center document - How to work with the operation stack:
...
7
votes
1answer
424 views
How can I change the class of one pixel in a classified image?
I have a classified image (I did it in ERDAS) with six categories. There are some misclassified pixels (especially high-density urban category). Is there any way that I can choose one pixel and then ...
7
votes
1answer
748 views
automated georeferencing
I am attempting to fully automate the process of georeferencing a load of .png files - i have xml file containing the co-ordinates - but how can i use them?
Does anyone have any advice?
7
votes
1answer
387 views
In ESRI ArcMap, how do I refer to NaN or ±∞ (special floating point values) in definition queries?
I have by chance discovered how ESRI ArcMap displays special floating point values to the user.
+∞ (positive infinity) is displayed as 1.#INF
–∞ (negative infinity) would supposedly be displayed as ...
7
votes
1answer
829 views
Permanently Change ArcMap's “Maximum Sample Size” Setting?
I've lately been working on feature classes with a huge number of polygons (e.g. all of the Census blocks within the Chicago metro area). I've been needing to symbolize them by quantities a fair ...
6
votes
5answers
1k views
Running ARCgis 9.3.1 and 10.0 on the same machine
I have the full installation Media for 10 (9.3/SQL05 already loaded). And two editor licenses (one loaded and a new license file). What manner of wizardry is involved in getting around the conflict ...
6
votes
5answers
8k views
I am struggling to convert .dwg to .shp, ideas?
Any ideas as to how can I convert dwg to shp?
I tried Kosmo and gvSIG. gvSIG kind of worked but it seems like I lost information..
in addition everything was converted into lines, no polygons. I can ...
6
votes
3answers
3k views
Arcmap: attach python script to a button?
In ArcMap 9.x how can I attach a python script to a button?
6
votes
5answers
2k views
Why won't ArcMap 10 snap?
I'm really confused by this. ArcMap will seeminly randomly decide to not allow snapping when editing. Sometimes its only for certain features, sometimes for only parts of the same feature (e.g. one ...
6
votes
3answers
1k views
Label Expressions to replace null values with text not in feature class
I need to label some hydrants (points) - some of these belong to the fire brigade and have a number assigned to them, some do not and thus do not have a number. I would like to write an expression ...
6
votes
1answer
2k views
How to choose selectable layers in ArcMap 10?
Maybe I'm missing something, but I cannot figure out how to toggle selectable layers in ArcMap 10. In 9.3, I remember being able to choose from a list which layers I wanted to be able to select ...
6
votes
6answers
519 views
Finding shortest path while avoiding polygon features
I'm developing an extension to ArcMap where I have a set of static, concave polygon features and I'm trying to find the shortest path between 2 points without crossing any of the polygons.
Is there ...
6
votes
2answers
447 views
How to refresh the ArcMap display using ArcPy?
Was trying to replicate a RePast Agent Analyst simulation using just Python and arcpy. The script was about urban expansion. The script just changes the values of a column in a shape file. ArcMap's ...
6
votes
2answers
2k views
How to reverse geocode with ArcMap?
What steps to I have to take in ArcMap (ArcEditor) to input a lat / long and return nearest address?
I found the Reverse Geocode tool but I can't figure out what to put in the "Input Features" and ...
6
votes
1answer
273 views
overlay county shapefiles for 2 different years
I have county-level shapefile for South Caroline in 1880 and one for 1940. I would like to overlay these two files so that they do the union and indicate the percentage of the land in 1880 that went ...
6
votes
3answers
174 views
How can you find ArcGIS version programatically?
Is there a way using ArcObjects.net to find out what version of ArcGIS is installed on a machine (i.e. 9.3., 10.0, 10.1)?
6
votes
2answers
926 views
Cartographic techniques for symbolizing routing data
Some common problems with displaying routes created from street data, such as bus routes, include:
Routes may overlap themselves, such as when a route takes the same road in opposite directions
...
6
votes
2answers
99 views
What event is fired when a feature is edited?
When the user draws a new feature (line, point, etc.) in ArcMap, there are null attributes.
If the user enters values in these null fields what is the event that is fired?
I want to control the ...
6
votes
2answers
200 views
Can I have the “store relative pathnames to data sources” box checked as the default?
Is there a way to have the "store relative pathnames to data sources" box checked as the default rather than always having to go into the document properties and check the box? ArcMap 10.0.
6
votes
2answers
780 views
Changing Button's Enable-State on ArcMap10-Start
How can the enable-state of a AddIn-Button be influenced on start of ArcMap? My button should be disabled on startup of ArcMap and than turned enabled when the Edit-session is started.
In ArcGIS 9.3 ...
6
votes
1answer
200 views
ArcMap 10: How do I escape certain characters when labeling?
I am labeling certain Oil & Gas areas by Operator in ArcMap 10, using this expression:
"" & [OPERATOR] & "" & vbNewline & "" & [UNIT_NAME] & ""
The only problem is ...
6
votes
2answers
291 views
How to alter transparency by spatial location
I'm trying to create a map that has a all layers within a subject area having 0% transparency (full opaque), while features outside that area (defined by a polygon shapefile) having a reduced ...
6
votes
2answers
566 views
How to create regular soil sampling grids?
I need to be able to set up a soil sampling grid at regular spacings of around 50 - 100 meters. Then export the points to a GPS so I can be guided to the points. I am new to GIS and have tried to do ...
6
votes
2answers
973 views
Change from layout view to data view using python? (ArcMap 10)
Is there a way to change from layout view to data view using python? I would prefer to do it using arcpy.
6
votes
3answers
122 views
How to efficiently read and reclassify many rasters in R
I've been tasked to create a suitability analysis of wave conditions in the Gulf of Mexico. I have 2 thousand or so raster files that are about 8 MB each (2438 columns, 1749 rows, 1km cell size). ...
6
votes
1answer
226 views
Use Python to find the pathname of “Current” Arcmap
I am trying to find the path name of the current ArcMap document that the python script is currently running in.
For Example:
"F:\2012\1111\MyArcMap.mxd"
I tired using
sys.argv[0]
as shown ...
6
votes
3answers
2k views
Convert .mxd with embedded VBA command button to ArcMap 10
I'm trying to convert an .mxd file from an older version to ArcMap 10. The old version had two simple VBA scripts attached to toolbar buttons. I am trying to convert this .mxd to ArcMap 10. For ...
6
votes
1answer
184 views
Why does tool take longer to run when in Python script?
I have written a python script that does some euclidean allocation. For that I use arcpy.gp.EucAllocation_sa() method. Now, my python script takes 30-40% extra time than spatial analyst euclidean ...
6
votes
2answers
890 views
How to determine elevation drop along a stream with ArcGIS?
I need to calculate(estimate) hydraulic head(elevation drop) along a single river stream in order to find potential site for small hydropower plant.
I have a DEM with 20m resolution and raster and ...
6
votes
3answers
391 views
How could I compare polygons with appropriate circle?
My problem is that I have a polygon shape file with 1034 records which are the Greek municipalities. My goal is to compare the shape of every record with the circle. In other words, I want to observe ...
6
votes
1answer
310 views
Why does ArcGIS copy & paste layer in a TOC sometimes change the Data Source of the layer?
I run into this situation all the time;
I often just copy layers and groups of layers in the TOC of one Map Document and paste then into the TOC of another Map Document.
For the most part this ...
6
votes
1answer
477 views
Inserting newlines in Rectangle Text elements via ArcPy causes overlap
I ran across an issue the other day when I tried to use ArcPython's mapping module to edit rectangle text elements with newlines (\n) in an ArcMap document. Here's what the output looked like:
...
6
votes
1answer
416 views
Editing tables using SQL in ArcMap
We've recently started working with ArcMap, having used MapInfo previously. I've created a shapefile in ArcCatalog and want to update some columns using SQL. In MapInfo I'd write the following command ...
6
votes
1answer
689 views
How to always enable an ArcGIS toolbar?
On ArcMap 9.3.1, is there a way to ensure that a toolbar is always enabled? In my case, I want the Standard toolbar (the one with new/open/save/print icons) to always be visible. I'd like the ...
6
votes
1answer
592 views
Coordinate grid display on a rotated map
I have a series of maps that require me to rotate my data frame within my layout screen (north "rarely" points up in these maps). I ONLY want to show east coordinates on the top/bottom and ONLY north ...
