Top new questions this week:

Zigzag Line Symbol in QGIS

I'm looking for a zigzag line symbol in QGIS. Is there perhaps an easy way to do this that I'm missing? I have tried creating a marker line using a simple triangle marker (^) and adjusting the size of ...

qgis symbology polyline markers

asked by Joanna McMillan 10 votes answered by James Conkling 1 vote

why do people use geometry to represent geography?

Historically I've mainly worked with simple latitude and longitude coordinates in a SQL Server. I stored them as a geography datatype in SQL Server, and rendered them on a variety of displays ...

coordinate-system projection-conversions sql-server geometry geography

asked by radpin 8 votes answered by mapBaker 7 votes

Select by Attribute within a specific area (using Select by Location?)

I have a map with four layers. Two of these layers cover an entire state, and the other two focus on the area I'm actually interested in within the state. I'm trying to Select by Attribute with one ...

arcgis-desktop arcmap select-by-attribute select-by-location

asked by user3738728 6 votes answered by Chris W 4 votes

Making world map to show where hole drilled through centre of Earth starts/ends on land vs water?

I am discussing drilling through the Earth with my students. The classic cartoon version has a person drilling down in the United States and coming up in China, which has to be wrong because drilling ...

cartography antipodal

asked by John Perkins 5 votes answered by Chris P 5 votes

How to produce high-resolution DEMs from new Sentinel-1 data?

This is a general question relating to the new Sentinel-1 data. I'm interested in the potential for using this data to create high resolution DEMs in GIS (I use QGIS), to investigate archaeological ...

qgis dem remote-sensing sentinel-1

asked by Richard 5 votes

How can I match the cells of two rasters?

I have many raster files each one containing information that is different from the others (e.g. one contains information on rain, the other on altitude, and another on land use). The cells in each ...

arcgis-desktop arcgis-10.1 raster merge

asked by Paul 5 votes answered by user23715 2 votes

Is it possible to set the permissions Geoserver creates new directories with?

I'm trying to automate the process of pushing from a server to Github as a way of tracking Geoserver changes, and pulling from Github as a way of deploying new work. The push side works fine, but if I ...

geoserver linux collaboration

asked by Eldan Goldenberg 5 votes answered by Andrea Aime 2 votes

Greatest hits from previous weeks:

How to convert KML to shapefile without losing attributes?

I'm new to QGIS and all geoinformation itself but have to work on some difficult stuff. I have a KML file with hundreds of points. To each point there is information, such as Name, Power, Age (it's a ...

qgis kml import

asked by Felix 13 votes answered by AndreJ 10 votes

What are Esri's new "ArcGIS for Professionals" and "ArcGIS Pro"?

After looking through all the stuff that was released or talked about at the Esri UC I am still genuinely confused by what ArcGIS for Professionals is. I will admit that it looks pretty cool, and has ...

arcgis-desktop arcgis-online arcgis-platform arcgis-pro arcgis-10.3

asked by Craig 39 votes answered by Jim McKinney 36 votes

Can you answer these?

Converting LANDSAT-8 TIFF to matrix, data frame, or SpatialGridDataFrame formates

I need to correct the reflectance values of LANDSAT-8 data for steep terrain and find it too tedious and clunky in ArcGIS. The data I have is: LANSDAT-8 DEM (ASTER) Slope and aspect (Derived using DEM ...

r convert landsat file-formats normalize

asked by Raadad 2 votes

Rotate map with dynamic display layer?

I am developing an application using the dynamic layer. However, I have trouble rotating the map (Not the same as rotating data frame by default). See more details: ...

arcgis-10.1 arcobjects

asked by Phan Đắc Sơn 3 votes

How can ASTER elevation data be converted to a CAD model

I am trying to convert ASTER elevation data to a 3D CAD model using only opensource software. I have tried using different file formats but I have been unsuccessful. I use QGIS for my GIS work and ...

3d elevation cad aster

asked by Douw 3 votes