DPSSpatial_BoycottingGISSE
  • Member for 9 years, 4 months
  • Last seen this week
Installing latest QGIS version on Ubuntu?
87 votes

The instructions on the QGIS download site are not as intuitive as I'd like, but they do work when you know the command syntax: First, what version of Debian Linux (Ubuntu / Mint) are you running? The ...

View answer
Choosing SRID and what is its meaning?
60 votes

An SRID is a coordinate system. We're taught in (traditional / Arc) "GIS" to always store your data in a projected coordinate system, because we're going to eventually use some calculation like 'area',...

View answer
How to change page size in QGIS Composer
33 votes

If anyone is having this issue in QGIS 3, the settings are hidden (for now?)... Right-click the page Choose 'Page Size' The 'Item Properties' panel now contains your page size settings (it doesn't ...

View answer
Getting shapefile of river from OpenStreetMap?
Accepted answer
26 votes

Use the Overpass Turbo API! First, I'd go to openstreetmap.org, You can either 1) Search for the feature you're after. I chose "south platte river", which runs through Denver. This gives the ...

View answer
Cut polygon shapefile by line shapefile
Accepted answer
24 votes

There is a QGIS plugin called Digitizing Tools: The documentation says: Split selected features with selected line(s) from another layer applies to: line and polygon layer (multi or single part) ...

View answer
Is there any Google Maps-like zoomable world map, but with an equal-area projection?
Accepted answer
18 votes

Check out this site: earth.nullschool.net when you launch the site, click the 'earth' text, then explore the different projection options... you can pan and zoom on the map too! Not as detailed, but ...

View answer
Creating new layer from selection in QGIS
17 votes

A new feature just came up in QGIS 2.2 called "Paste as new vector layer": It is a common activity in a GIS to create a sub-selection and then to create a new layer from the selection. In QGIS you ...

View answer
Using Engineering symbols (*.svg) in QGIS?
16 votes

Here are points in the table of contents: Here's what my SVG that I downloaded from some website looks like to Windows Explorer in my downloads folder: And what it looks like in IE: Now double-...

View answer
Using geometry rather than geography data types in SQL Server Spatial?
Accepted answer
15 votes

There's a good answer over at Stack Overflow, which goes a little something like this: The geography type is a little bit more restrictive than geometry. It can't cross different hemispheres and ...

View answer
Set the QGIS display to show decimal degrees?
Accepted answer
14 votes

Within the Project Properties > General dialogue box, you should have an option to set the Canvas Units: However: it seems for using Decimal Degrees as your display units, your map must be projected '...

View answer
Calculating the length of the network lines inside polygon in QGIS 2.10.1
Accepted answer
12 votes

Give the Sum Line Lengths tool a try, from the Vector > Analysis Tools menu: This will create a new shapefile that summarizes each input polygon vector layer feature by the length of input line ...

View answer
How can I work with very large shapefiles (~1 GB) in QGIS?
Accepted answer
11 votes

Load the data into SpatiaLite in QGIS... best way is to create a new SpatiaLite database via the right-click GUI in the browser window, then simply drag and drop your shapefile onto the SpatiaLite ...

View answer
Navigate two leaflet maps
Accepted answer
11 votes

Here's a blog post that shows how to sync two leaflet maps: Creating a synchronized view of two maps or images with Leaflet Then, as per a question in the comments, a plugin that shows how to sync ...

View answer
Should you switch from ArcMap to QGIS?
11 votes

It's not easy just to switch to QGIS if you've decided to stay invested in the Arc-Geodatabase. I would say don't switch. You'll have more trouble mixing the technologies than it would be worth. The ...

View answer
Adding a GIS feature to existing database entry with QGIS
11 votes

Figured this out! (also asked here) A record in a spatial table (Shapefile, PostGIS, Spatialite) that has no geometry can have geometry added by adding a 'part' to the feature using the advanced ...

View answer
How to Geocode a Google SpreadSheet?
Accepted answer
10 votes

1) There's a bit of code you can add to your spreadsheet and run a macro. The instructions are detailed here: https://vilimpoc.org/blog/2013/07/11/google-spreadsheet-geocoding-macro/ with the code ...

View answer
Adding Basemaps from Google or Bing in QGIS
10 votes

If you're looking to add the ESRI basemaps to QGIS, follow the steps in this blogpost using the QGIS Python console: Copy and paste this code into the QGIS Python Console: Adds ...

View answer
Combining multiple overlapping rasters - retain maximum value?
10 votes

Give the SAGA "Mosaik raster layers" tool a go: From the 'Processing' menu, choose 'toolbox' - type 'mosaic' in the search box to reveal the "Mosaik raster layers" tool: Launch the tool, choose your ...

View answer
How to use STUnion with GroupBy
10 votes

I use the GEOMETRY::UnionAggregate function in SQL Server to do this for our Elem, Mid and High boundaries In the dbo.SchoolBoundaries table below, the ELEM_NUM value is what I want to group on, and ...

View answer
Creating raster with distance to feature using QGIS?
Accepted answer
10 votes

If I understand your problem, you can create a raster distance layer and clip that output to your region polygon. Create a raster distance layer using the Raster > Analysis > Proximity (Raster ...

View answer
Reprojecting a raster DEM from meters to feet using QGIS?
Accepted answer
10 votes

You're not actually 'reprojecting' the data (the coordinate system, that is), you're simply multiplying it by a constant (as in the 'times' tool in ArcGIS) to change the pixel values from one number ...

View answer
Making spatial view in PostGIS and adding it as layer in QGIS?
9 votes

(Updating my answer slightly) As long as the OBJECTID (row_number) field is first in the column definition of the view, QGIS will pick it up without asking you to add from the 'add vector layer' menu....

View answer
Removing "QGIS ROCKS" text box?
9 votes

You've added text annotation to the map. Click the Annotation button I've highlighted, can select each one, and delete them.

View answer
SQL Server Spatial Querying
Accepted answer
9 votes

If you've got a polygon you want to use as a declared variable and intersect it with a table containing existing geometry, your query (including your polygon variable declaration) would look something ...

View answer
Basemaps provided by Esri
Accepted answer
8 votes

Both clients - QGIS and ArcGIS Desktop/Pro - are rendering the same information - tiles of imagery, basemaps, etc. So really just images at the exact same resolution, so it has nothing to do with the ...

View answer
How to Create a Heatmap in PostGIS
8 votes

The only way I've thought about truly doing a heatmap and/or density map in PostGIS is to break down what density is really doing: Create a grid of X cell size - this could be a vector dataset, ...

View answer
Cut/Clip/Split a polygon with another polygon from same layer
8 votes

There is a plugin called Digitizing Tools that has the feature "Cut with polygon from another layer"... In the image below I am editing the Green layer and have a polygon feature selected from the ...

View answer
How do you import a .SHP into Sketch-Up?
Accepted answer
8 votes

@mapperz provided this answer: http://enja.org/enjshape/ This is a great plugin and works like a charm. It is, however, very sensitive to coordinate systems, so I would suggest: make sure your SHP ...

View answer
Tie line width to map scale by a formula?
Accepted answer
7 votes

You can build an expression in the line width setting that would look like this: sqrt(32000/@map_scale ) @map_scale is a variable in the expression builder, and sqrt is a function available in there ...

View answer
Getting list of distinct values from shapefile field using QGIS?
7 votes

Use the QGIS DB Manager and access your shapefile via 'virtual layers' You can then use the SQL window and write your query:

View answer
1
2 3 4 5
16