To show, hide, extract, or remove particular data from a larger set, narrowing it down, or the specific criteria used to do so.

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2
votes
2answers
396 views

How can I tell mapserver to ignore a filter that is set in a mapfile?

How can I tell mapserver to ignore a filter that is set in a mapfile? I am displaying a wms layer with point features using mapserver. In one of the layers in my mapfile I have defined a filter ...
1
vote
3answers
2k views

How to show vector features in OpenLayers after hiding it?

I did change some vector features style (through check-boxes) using style property : var features = layer.features; for( var i = 0; i < features.length; i++ ) { //features[i].style = { ...
2
votes
1answer
121 views

spatial data filtering without GIS?

I have access to a database here (description of the columns are also available) containing spatial data in text format and with WGS84-EPSG:4326 coordinates. I would like to only select data in my ...
0
votes
0answers
55 views

QGis Smooth Raster DEM [duplicate]

Possible Duplicate: Raster generalization - buffers in rasters, expand pixels? I have a 1m LIDAR DEM which I'm manipulating in QGIS. I'd like to smooth the DEM, such as by having each ...
4
votes
1answer
240 views

Given a known batch of mobile-obtained gps data with timestamps, what algorithms can be used to clean it?

I'm working on the backend for an iOS/Android app that collects locations every hour and syncs with the server every three hours. The mobile apps themselves are not under my control and so I can't ...
1
vote
1answer
647 views

Having difficult time to implement a Rule using OpenLayers.Filter.Function

I'm trying to set up a Rule using the Function Filter. But it does not work: the lines on that layer are just black. And more importantly, the filtering function is never executed. Can someone please ...
1
vote
2answers
2k views

Passing selected polygon to INTERSECTS filter in a WFS request

In the code below, <ogc:Filter> <ogc:Intersects> <ogc:PropertyName>the_geom</ogc:PropertyName> <ogc:Function name="querySingle"> ...
0
votes
1answer
620 views

GeoServer: Cross Layer Filtering vs Layer Groups

To pull features using WFS from several layers in one request, I have two options: One, create a layer group, and then get features from the layer group, as opposed to individual layers. Two, use ...
2
votes
1answer
841 views

Filtering a loaded kml file in OpenLayers

I'm trying to create an interactive search engine (for finding event tickets) of which one of its features is a visual map that shows related venues using OpenLayers. I have a plethora of venues ...
6
votes
1answer
646 views

PostGIS query vs QGIS filter

I have a PostGIS dataset with around 3 million shapes. I only need to view about 1,500 of these shapes at any given time, but the shapes I need to see depends on which feature is selected in a ...
2
votes
1answer
886 views

Filtering a raster by pixel value ? (Qgis)

I have downloaded Globcover data in GeoTIFF format. I want to create a new grid which only has values where the Globcover data (the only band in the TIF file) has one certain value (==190). Can I do ...
2
votes
1answer
436 views

Filter Points Layer by Polygon Layer

I come from the Java world and go straight to C# and ArcGis 10 (I have to make a simple task for the university). So this means I don't really know much of C# but I can live with it and don't know ...
3
votes
1answer
4k views

How to filter features in a layer?

I am trying to display certain features in a shapefile-based layer using QGIS. I have found the subset function in the properties panel, which does exactly what i want, but is too tedious given that I ...
2
votes
2answers
1k views

GeoMedia WebMap with WFS 1.1.0 Filter Examples?

I'm having problems forming a GET query for WebMap spatial data using WFS 1.1.0. My query looks like this: ...
2
votes
1answer
425 views

combine two OCG filters in Openlayers : ERROR: invalid input syntax for integer

i need to combine two OCG filters. each one works fine separably but if i combine them using Filter.Logical.OR, the first one works only. var c_filter = new OpenLayers.Filter.Logical({ type: ...
2
votes
3answers
4k views

OpenLayers WFS protocol: work with filters if the protocol is defined out of layer constructor

follow question:wfs-load-feature-check the scenario is: i am trying to load a WFS layer, since it takes a while to load all features, I want to give user a notice while waiting for response. the ...
2
votes
2answers
201 views

Query/find features in ArcPad, hide the rest in map?

Trying to help out another department that does quarterly assessments of field data. Their symbology is all set by the status of the assessment (the only way I could figure out how to hide something ...
1
vote
2answers
496 views

How to use the SLD Filter “Difference”

I have a postgis table with polygon geometries. I would like to create an sld which first does an inside buffer, and then a difference between the buffer and the original geometry. This is basically ...
4
votes
2answers
1k views

What is the best approach to using IQueryFilter.WhereClause in ArcObjects?

What is your preferred / best approach to using IQueryFilter.WhereClause statements in ArcObjects (e.g. when selecting features by attributes)? You need to check the source type (shapefile / personal ...
6
votes
1answer
1k views

How to filter wrong GPS readings?

I have absolutely no experience with GIS, it just so happens that one of the hobby projects I am doing at the local hackerspace includes tracking a model boat with a GPS... I hope this is the right ...
3
votes
2answers
3k views

OpenLayers: Combine multiple OGC filters

I have two OGC filters client side: <ogc:Filter xmlns:ogc="http://www.opengis.net/ogc"> <ogc:PropertyIsEqualTo matchCase="true"> ...
4
votes
3answers
3k views

How to properly utilize DWITHIN Spatial Filter in OpenLayers

Given the following code: var points = []; points.push(new OpenLayers.Geometry.Point(-110, 38)); points.push(new OpenLayers.Geometry.Point(-108, 40)); var lineString = ...
3
votes
1answer
880 views

Case Insensitive WFS Attribute Search with ArcGIS Server?

I'm using ArcGIS 9.3.1 to host WMS and WFS services. I have a map (.mxd file) with a layer whose attribute table includes fields with mixed-case string data. When I open this map in ArcMap and ...
2
votes
1answer
756 views

How to query some properties of a list of typenames in geoserver

I want to query selected propertynames from a list of Typenames in Geoserver. I could find an example from OGC WMS 1.1.0 Implementation Specification ( pdf document page 80 Example 10) which is not ...
2
votes
1answer
589 views

Is there any way to perform spatial filter on multiple layers together?

I have a scenario where a featureclass[Child Version] is queried for some overlapping features on [SDE.DEFAULT] Version using ISpatialFilter, After getting few result, these features are looped and ...
11
votes
2answers
3k views

How to filter big datasets in Geoserver WMS?

Is there a good way to filter datasets with approx 50,000 features in Geoserver? I'd have to select between 100 and 200 features based on ids. These ids are different from the FeatureIds. Couldn't ...
8
votes
1answer
856 views

How to apply a Majority filter in GRASS GIS?

I was wondering if someone could help me write a majority filter for GRASS GIS. I have this map (see below) which I need to run a filter over to make the red areas a bit more dominant. I know I can ...