Tag Info

New answers tagged

0

I came up with another workaround: Copy the whole layer in question. Set it to display at all zoom layers, but set its symbology settings so that i does not display anything at all (for instance, in the Symbol Selector, click edit symbol and then pick a blank Character Marker). But keep the display settings for selected features (specified on the Selected ...


2

As a supplement to Brad's answer, there is no setting or option to accomplish this automatically. That being said if this is just a one time operation it can be accomplished in two clicks. Once you have your selection: Right click the layer in the TOC navigate to the 'Selection' menu and click 'Create Layer From Selected Features'. This will create a ...


2

Using esri streetmap data you can get an idea of how to accomplish multiple zoom levels on 1 layer. You should either have a dvd that came with your product or can download it with your global login at my.esri.com. For example in the transportation layer group they have road with multiple zoom levels. No matter what scale you zoom to one of them turns on. ...


0

you could use "spatial join" to get the distance between the building and the vaccination center. If your vaccination centers are far apart, then you can do it in one go. Otherwise, some building could belong to two or more vaccination areas, so you need to select the 300 closest building for each poit separately. Then you need to use a Python or, if you ...


0

To do this I think you should use the Generate Near Table (Analysis) tool which: Calculates distances and other proximity information between features in one or more feature class or layer. Unlike the Near tool, which modifies the input, Generate Near Table writes results to a new stand-alone table and supports finding more than one near feature. ...


1

I tried this with a Spatialite layer now, same result. Interestingly, QGIS shows "SQLite error: Expression tree is too large (maximum depth 1000)" in the Spatialite log panel. I've raised this issue on the mailing list and the SQLite bug should now be fixed in the latest developer version according to ...


3

Yes, it's possible, using the new Python function editor in 2.8 or later. For a good tutorial check out this youtube video Your existing expression will always show the value of field "LAENGE" for all features, this is working as expected. What you really want is an $is_selected() function which evaluates to True if the feature is selected, or False if it ...


0

Using QGIS and the Multi-distance buffer plugin, your buffer zones around the locations of traffic intersections would be non-overlapping, and each zone would be identified in the attribute distance by the distance to the outer border of the zone. That means that you can do a simple spatial join or point-polygon overlay to get the buffer zone added to your ...


0

I would go as below- Use "Dissolve Option" to "ALL" in "Multiple Ring Buffer" tool. Split this buffer layer into several layers by buffer distance- have a look here if needed. Use CountFeatureWithinLocation tool where "Search Radius" is set to "Zero". It create a field in the "Input" Feature's table that shows count. N.B. Give feedback if needed.


1

Thanks to @RhodiumToad on #postgres, trick is to use sub.geom instead of table. select row_to_json(t) from ( select * from ( select * from table where height>1500 ) as sub where st_intersects( st_transform( st_setsrid( ST_geomfromgeojson( ...


5

You need a ST_GeomFromGeoJSON select * from points p where ST_Within( p.geom, ST_GeomFromGeoJSON('{"type":"Polygon","coordinates":[...]}') ) Edit: ST_Intersects works also (need to set SRID on GeoJSON, and transform): select row_to_json(t) from (select * from table where st_intersects( st_transform( st_setsrid( ...



Top 50 recent answers are included