A representation of a real-world objects on a map.
14
votes
5answers
4k views
What's the difference between feature class and feature layer?
This may be very trivial question. To me they seems very similar in concept. What's the difference between feature class and feature layer?
11
votes
2answers
3k views
How to use label classes, expressions, and annotations?
I've always found that when it comes to python, vector analysis, QGIS gives ArcGIS a run for its money, hell some of the qgis plugins exceed ArcGIS's performance by a few hours; however, I always have ...
10
votes
5answers
734 views
What is the fastest (performance-wise) way to serve PostGIS features?
I'm interested in the fastest way to serve PostGIS features. I can find several WMS improvements and alternatives (MapProxy, TileCache, Mapnik...) but not so many WFS Open Source improvements and ...
10
votes
3answers
340 views
What are some of the features available in non-FOSS GIS software that you'd like to see in your favorite FOSS GIS
For example, a program I use (TransCAD) has the ability to do travel time matrices based on minimal data input, which is really useful if you're looking at doing back of the envelope type ...
9
votes
3answers
2k views
What is quickest way to select polygon by point in ArcGIS 10 using ArcPy?
I keep thinking that I must be missing something, but there does not seem to be a tool in ArcGIS 10 to select features (in particular polygons) from a layer at a point (X,Y) location via ArcPy. The ...
9
votes
1answer
854 views
Dealing with overlapping features in OpenLayers
If users create a polygon feature that completely overlaps another one, like this …
… then there's no way you can select the inner feature, i.e. the one that's overlapped by the other. I'm ...
7
votes
4answers
2k views
Get all the points of a polyline
I have some polyline feature objects in python. Now I want to get all the points of polylines.
For example, if a polyline has start point [0,0] end point [5,5].
Result: ...
7
votes
2answers
142 views
How to remove long linear strips from polygons?
I have a polygon layer representing impervious land cover. This was taken from a land cover raster dataset. The impervious data represents all impervious surface that is not buildings or roads. I ...
6
votes
3answers
1k views
How to delete feature class features faster (ArcPy)
I have written this script that recurses through all feature classes in a given set of feature datasets and deletes all their features. It appears to do the job but it runs pretty slowly. Is there ...
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
1answer
2k views
How to select multiple Features from multiple Layers in OpenLayers?
Is there a way to select multiple features from multiple vector layers by using clickTolerance in click?
I checked the documents of getFeature control and selectFeature control, seems not work in ...
6
votes
1answer
1k views
How to Verify if a FeatureLayer already exists?
I am currently working on a project where when user loads up their map (mxd) into our system, we create several custom featuerlayers for them. My problem is though, I have no idea how to check if I ...
6
votes
2answers
185 views
Why am I getting duplicate ghost points (features), i.e., one point in the feature class but two points?
When editing some of the attributes in a point feature class in ArcMap 9.3, duplicate labels started showing up. When I click on the point, I discovered that the point has duplicated itself BUT there ...
6
votes
1answer
73 views
How to store and serve data and its progress over time in GeoServer?
I recently started working with GeoServer and stored some shape files. I successfully can retrieve the data as JSON. The data I want to maintain in the database changes over time. I do not want to ...
6
votes
1answer
307 views
Display Feedback “Stutters” When Moving Features
I have a custom tool for moving features that implements IDisplayFeedback and geometry-specific CoClasses to show the user where they are moving the feature.
IMovePolygonFeedback polygonFeedback;
...
5
votes
5answers
378 views
Where to find a list of geographic 'objects'?
Is there an extensive list of geographic "objects", "entities" or "features" that can be discovered in the geographic environment, relatively static and therefore can be geo-located and represented on ...
5
votes
3answers
248 views
Selecting polygons by number of sides
I'm using ArcGIS 10 to build some figures for a journal article. One is a figure of an unstructured finite element mesh of triangles spanning the western Atlantic Ocean. I exported this mesh from ...
5
votes
1answer
508 views
Drag a Feature in ESRI, ArcObjects Engine (AxMapControl)
I'm trying to implement moving a point feature in a custom C# ArcGIS Engine application on an AxMapControl. I've already created a custom tool to do some other things. And I can track when the user is ...
5
votes
2answers
430 views
Fastest way to merge a feature
I am writing a arc engine application that can take a shapefile, and merge a set of polygons together.
Here is the code that I am using to merge the polygons:
private static void ...
5
votes
3answers
1k views
Slow IE8 responsiveness with OpenLayers and many features
Background
Adding about 700 sites to an OpenLayers Map. Firefox 11 and Google Chrome display the sites just fine. IE8, which is the organization's standard and will not be upgraded for the ...
5
votes
2answers
2k views
How to export multiple featureclasses to shapefiles?
I have plenty features in a geodatabase. I need to save/export them into shapefiles, because my mate works with Manifold, which is not able to read geodatabases. Any Ideas? Click on every single layer ...
5
votes
2answers
1k views
Clip (Analysis) in ArcGIS 10 running indefinitely
I am attempting to clip a series of polylines (cross sections) using a single polygon. There are approximately 2400 polyline features in my input featureclass. Is this too large for the Clip tool to ...
5
votes
2answers
91 views
How to Count Features in a Feature Type in FME?
I am reading around 120 spatial tables in FME. I would like to export a spreadsheet or CSV using FME that contains the feature name (table name) and the number of records in that table.
So far, I've ...
5
votes
3answers
265 views
How to update feature positions with clustering in OpenLayers?
I have an OpenLayers 2.12 map with a vector layer with a cluster strategy. All the static behavior is how I want it. Now I'd like to add the possibility to update the features' position. I do this ...
5
votes
1answer
125 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 = ...
4
votes
2answers
136 views
What's the difference between “Copy Features” and “Feature Class to Feature class”
I have a feature class within a feature dataset in a FGDB, and I need a copy of it in another FGDB.
In ArcGIS 10.1, I've used the "Copy Features" tool, and it looks to be the same (according to the ...
4
votes
1answer
342 views
Is there a way to get the X,Y from a feature class?
I currently have an instance of a selected feature class, and I want to be able to get the midpoint X,Y (if its polygon) or the X,Y (if its IPoint) of the feature from the layer, is there some build ...
4
votes
1answer
284 views
Need to delete all but one feature from a set of features with the same ID, keeping the one with the largest area
I have a large polygon layer in which most of the polygons have a unique name in a text field. Of the hundreds that aren't unique, there will be 2-4 polygons with the same name but different ...
4
votes
3answers
2k views
Change Icon of Single Vector Feature in Layer
Currently I am trying to change the icon of a particular feature of a vector layer that the user is focusing on. I add each feature to the map like so:
var point = new ...
4
votes
2answers
223 views
How to select features that intersect but don't touch (using ArcObjects)?
So how do I do that? ArcMap's Select By Location selects also all features that touch, but I only need the ones that actually intersect the area.
I currently use ...
4
votes
3answers
1k views
How to delete multiple feature classes simultaneously?
I created a number of feature datasets to temporarily store the output of some ModelBuilder models. Each dataset contains several thousand feature classes, and the idea was that I could just delete ...
4
votes
1answer
463 views
merge selected features and programming
I have a shape file with UK districts and unitary authorities. In the past, using commuting patterns, I worked out a new geography which is close to travel to work areas.
I now would like to create a ...
4
votes
1answer
150 views
Retrieve data from FeatureClass
I have :
FeatureClass (Structure)
column (Type)
column (OID)
I am trying to get the (Type) for specific OID.
I tried to use this code but it dose not work.
IFeatureWorkspace featureWorkspace = ...
4
votes
3answers
289 views
Can I prevent features from being created outside an OpenLayers map?
In our app, we allow users to create features on maps. The boundaries of these features will later be converted into real-life latitude/longitude coordinates, but does not make sense if features are ...
4
votes
1answer
1k views
Geometry from multiple selected features into one geometry
Lets see if I can explain what I'm trying to do. First of all I have developed an AddIn for ArcMap that can take one selected feature (Polygon) on a layer, grab the geometry of that feature, and save ...
4
votes
1answer
4k views
How to get features in Openlayers vector layer
What is the exact API to get all features in a vector layer in OpenLayers? Suppose I have the "map" object, within which is a "Vector Layer": how can I obtain features in the layer?
4
votes
1answer
62 views
Is it possible show the feature attributes dialog when I add a feature in code?
I want to know if it is possible to make the feature attributes dialog in Qgis show up when I add a feature by code using:
QgsVectorLayer::addFeature( tFeature )
This is available when I add ...
4
votes
1answer
65 views
Creating a feature of a part of a state boundary from a shapefile of U.S. States
I have a shapefile of U.S. states. I want to create a feature layer from it so that I can do a Near analysis with it.
Suppose that I am interested in the Georgia boundary, but only the part of ...
4
votes
3answers
7k views
Hover/Popup feature problem
im really having an issue here.
I am trying to realise a map where i can hover over the features and they get highlighted (works), then i want to be able to click them (works) , i also want a div to ...
4
votes
1answer
613 views
How to integrate OpenLayers and ArcGIS Server?
I am using the OpenLayers JavaScript API within a web application. I am displaying non-base layers hosted on an ArcGIS server. When I load the ArcGIS layers, I load them using ...
4
votes
0answers
141 views
What open source solution would work best for auto extracting features from satellite images? [duplicate]
Possible Duplicate:
Feature Extraction - Land cover
I have been looking for an open source solution which would allow me to define a region (or collection of images) and extract features ...
3
votes
2answers
4k views
ArcObjects (vba) update selected feature/record
I would like to edit a selected feature/record via ArcMap vba, but I'm not having much luck with this code sample (see code below). I'm not getting an error, but the record selected is not updating.
...
3
votes
1answer
91 views
How to make 2 feature layers congruent?
I have 2 feature layers (polyline/polygon) which should be congruent but there's an offset of about 220 meters. The GEOREFERENCING TOOL does only work with raster layers. But what's with a feature ...
3
votes
1answer
507 views
Referencing Feature Dataset in File Geodatabase with ArcPy
It's probably an obvious one but since I'm new to arcpy I'd appreciate any help.
I'm trying to develop an arcpy script which will eventually loop through number of rasters and feature classes stored ...
3
votes
2answers
1k views
How to create a feature class in a file geodatabase in ArcGIS 9.3 with Python?
I'm not entirely sure if I am using the correct terminology, so I apologize in advance. What I am looking to do is create a file geodatabase and add a feature class directly into that file ...
3
votes
1answer
674 views
OpenLayers: Modify features without virtual vertices?
When using the modify feature functionality of OpenLayers, I get the option to move the individual vertices around.
But I also get a set of virtual vertices - each vertex located on the edge between ...
3
votes
1answer
535 views
Change data type in Excel file before creation of feature class
I am trying to import data from Excel spreadsheets where each point coordinate has a 'datetime' timestamp (e.g. "2012-06-01 14:45:32") associated to it. When I check the table properties ArcGIS 10 ...
3
votes
1answer
514 views
How do I fire a function after all features have been selected by a box in OpenLayers?
I have a map rendering with Polygons on a Vector layer set up as features. I set up the features so they fire off a function when the feature is selected and this works fine. The issue I'm having is ...
3
votes
1answer
1k views
How to Insert Feature into Feature Class (in Memory) ESRI
I'm looking for suggestions on how to insert a new feature instance into a feature class that is in memory -- assuming that I don't have access to the feature workspace. For example, the feature class ...
3
votes
1answer
103 views
OID for the last added feature
How can i get the Object ID for the last feature created ?
i use m_editEvents_OnSketchFinished() event to run some code, but i can't get the OID
of the most recent added feature.
