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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1
vote
2answers
500 views

Using sieve filter in ERDAS Imagine and/or ArcGIS for Desktop?

Where can i use a sieve filter for my supervised classification? Can i do it in Erdas Imagine or in ArcGIS? I can't find it anywhere.
2
votes
1answer
1k 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
3answers
5k 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 ...
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
960 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 ...
6
votes
2answers
543 views

How to de-noise a DSM

I have created a DEM, DSM, and nDSM from a LiDAR Point Cloud using SAGA-GIS. I extracted the appropriate returns from the point cloud, then converted to grid, and then closed gaps to fill in any ...
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 ...
2
votes
1answer
147 views

How to apply a filter to multiple vector layers in QGIS?

I am trying to apply an attribute filter to multiple layers in QGIS at once. The filter is to be applied to .osm data brought in through PostGIS to QGIS. I have tried selecting multiple layers -> ...
1
vote
1answer
108 views

applying savitzky golay filter to modis ndvi data

I want to smooth the ndvi MODIS 16 bit integer data .tif for LULC classification . i have timesat 3.1 software on windows but i don't how to apply the SG filter . i am not that good in programming . i ...
4
votes
2answers
320 views

Filtering Overpass-API by country

Does anyone know how to perform a overpass-api request like this? "Show me all banks in Germany"? I could just show all 'amenity = bank' in a specific bounding-box. But Germany (or most of all ...
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 ...
3
votes
1answer
5k 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 ...
1
vote
2answers
309 views

gdalwarp batch process

I have downloaded numerous hdf files from an ftp site. Half of them were level 1 and the rest were level 2. Lvl1 format is Afile.A1_AC.sample.hdf and the lvl 2 format is: Afile.A1_AC.sample.hdf. How ...
1
vote
1answer
418 views

How to use paging in a WFS query?

I am running a GetFeature request against a WFS server which does not support to download all data at once. Can I use ogc:PropertyIsGreaterThanOrEqualTo to split the dataset into chunks at download ...
1
vote
1answer
894 views

Openlayers - Vector Layer - Combining hide/show features using style property

I am trying to filter vector layer features according to their attributes. I have 4 check boxes: type_1, type_2, shape_1 and shape_2 Note that I am using Extjs for interface. at beginning I could ...
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
37 views

How to find out if a WFS instance supports filtering via CQL?

I am considering using Common Query Language (CQL) to add filter parameter to a HTTP curl query which runs against a WFS server. I found out that GeoServer supports CQL via WFS. Can I tell from a ...
0
votes
1answer
37 views

Filter (no display) layers in GeoExt.LegendPanel with names LIKE some pattern

This works to avoid Basemap layers such as Google Maps and overlays such as WMS to appear in the GeoExt Legend Panel: var legendPanel = new GeoExt.LegendPanel({ border: false, filter: ...
0
votes
0answers
59 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 ...