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
882 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.
6
votes
2answers
835 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 ...
7
votes
3answers
780 views

Filtering out canopies and buildings from DSM to have a bare earth elevation

Can anyone suggest methods in filtering out trees and buildings from a DSM so as to come up with a reliable DEM? What I have is a grid from a LIDAR data (.tif file, with 1m resolution). I was going ...
2
votes
1answer
2k 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 ...
4
votes
1answer
8k 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
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
1k 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 ...
3
votes
2answers
231 views

Limiting list values based on previous field in QGIS Forms?

Looking for assistance to set up appropriate configuration to enable drop-down lists values to be filtered based on a previous value. Basically, I have a 3-tiered categorisation structure to one of ...
2
votes
1answer
580 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 -> ...
6
votes
1answer
2k 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 ...
1
vote
3answers
4k 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 = { ...
1
vote
1answer
923 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 ...
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
456 views

How to set a spatial filter with Python/GDAL?

Is there a way with GDAL (Python) to set a spatial filter (bounding-box) on a raster before I process it? I want to read it as an array. BandReadAsArray(band, xoff=0, yoff=0, win_xsize=None, ...
2
votes
2answers
725 views

Las dataset to raster with ground points only

I'm trying to make a raster from a las dataset. I want to only use points classified as ground, but I can't figure out how to do this. What I've tried is: Create las dataset from 2 .las files. ...
2
votes
1answer
77 views

Filter the Feature Layer parameter in Python Script Tool

I have a Python script tool where I have a parameter of type Feature Layer because I want to have the already opened layers as a dropdown list. I was wondering if there is a way to filter this ...
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"> <ogc:...
1
vote
1answer
1k 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 ...
0
votes
1answer
76 views

Filtering parameters in ArcPy Python script tool avoid repeating selecting same value in sequence parameters?

I am trying to make a tool in which there are many sequence parameters (based on the same field of a feature class), and each of them is multi value to make a user choose from a check a list one or ...
0
votes
1answer
94 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
0answers
65 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 pixel ...