Geographic Information Systems Weekly Newsletter - Tuesday, July 29, 2014

Top new questions this week: What are the pros and cons of forcing square pixels on reprojection? I am using Erdas Imagine 2014 to reproject 4-band raster data from GRS 1980 NAD83 Lambert Conformal Conic (ft) to UTM GRS 1980 NAD83 North UTM Zone 11 (m). Unlike ArcGIS, Erdas provides the option to … arcgis-desktop arcgis projection geoprocessing erdas   asked by Aaron 6 votes How to split single address field into 4 fields (House No., Direction, Name, Suffix) I have to do some massaging of our parcel data to make it usable by a program in sheriff helicopters. The program requires one of the following address formats within the fields: Our addresses are … arcgis-desktop python arcgis-10.1 arcpy   asked by Craig 5 votes answered by Paul 8 votes Advantages of R-trees in comparison to geohashes Geohashes are being widely used in products like: Lucene, mongodb, etc and have become one of the most important technology of present day. Have Geohashes replaced the good old R-trees or do R-trees … spatial-database algorithm research geohash   asked by Jannat Arora 4 votes answered by Mario Miler 0 votes Is there a difference between the Planchon & Darboux and Wang and Liu depression filling algorithms? Other than speed? Can anyone tell me, based on actual analytical experience, if there is a difference between these two depression filling algorithms, other than the speed at which they process and fill depressions … dem topography   asked by traggatmot 4 votes answered by user1503949 1 vote Manually classifying graduated data outside of range in ArcGIS I have two shapefiles representing grids with values that are symbolized with graduated colors, shown below: You can see that the two shapefiles encompass similar ranges of data, but assign … arcgis-desktop arcgis-10.1 cartography symbology legend   asked by hfisch 4 votes answered by hfisch 2 votes Does the NED use geocentric or geodetic latitude? What kind of latitude does the National Elevation Dataset (NED) use? Geocentric or geodetic or something else? I can't find the information anywhere on their site (http://ned.usgs.gov/index.html) or … coordinate-system lat-lon united-states geodesy ned   asked by Kristin 4 votes answered by whuber 6 votes PostGIS non functional on Ubuntu 14.04 I am unable to create the PostGIS extension on new databases in Ubuntu 14.04: $ psql pg_testing -c "create extension postgis" ERROR: could not load library … postgis ubuntu geos   asked by Luís de Sousa 3 votes answered by Luís de Sousa 1 vote Greatest hits from previous weeks: General GIS Questions for Job interviews I am trying to gather general GIS questions that are asked in an interview process, not related to any particular software but questions that can test one's core knowledge about GIS. I will … learning-resources   asked by Raj 12 votes answered by Thomas 18 votes How to install Openlayers plugin on Qgis 1.8? After having installed Qgis 1.8 i am not able to find the Openlayer Plugin. In "the old days" I know I was supposed to check "add 3rd party repositories", but that button has disappeared? I tried … qgis qgis-plugins   asked by Lasse Jesper Pedersen 7 votes answered by Sirenology 9 votes Can you answer these? What determines direction in "Hatches"? I created a route layer that uses hatches to help determine addresses along a street centerline. About 90% of the time, the hatches go up from zero in the direction that the line was digitized but … arcgis-desktop arcgis-10.1 linear-referencing streets street-address   asked by jbchurchill 2 votes Question about projected coordinate systems 30m DEM for Contiguous US What is the best Projected Coordinate System (PCS) for the contiguous US (whole, not parts) if I want to maintain distance and area accuracy as much as possible across a nationwide DEM dataset? I'm … projection coordinate-system dem united-states accuracy   asked by traggatmot 1 vote QGIS distance from points to nearest line How can I get the distances from each point at a shapefile to the nearest line from another? I've tried to follow the directions from Measuring the distance between lines and points in QGIS and … qgis distance   asked by ebarbara 1 vote

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