Tagged Questions

6
votes
3answers
111 views

How to efficiently read and reclassify many rasters in R

I've been tasked to create a suitability analysis of wave conditions in the Gulf of Mexico. I have 2 thousand or so raster files that are about 8 MB each (2438 columns, 1749 rows, 1km cell size). ...
1
vote
1answer
103 views

Reverse geocoding to get city, state, country data separately?

I have longitude and latitude data. I need to reverse geocode to get city, state, country data separately. I have checked google service. Google provides complete address to a micro level. ...
1
vote
2answers
165 views

Merging many rasters using Python

I have a list of many many rasters. I want to have a simple and easy to understand script that takes this and merges it into one big mosaic. I found a similar question but the accepted answer adivises ...
1
vote
1answer
83 views

Rpy2 Unable to Load in Fresh QGIS Install

after installing qgis the a message given below is shown Unable to load the plugin: Unable to load required package rpy2. Please ensure that both R, and the corresponding version of Rpy2 are ...
3
votes
0answers
90 views

Draw two separate lines from A to B and B to A

I have an Origin-Destination table like this Origin Destination Value A B 10 B A 100 A C 120 ... For all the locations A, B, C... I have another table indicating their location (Lat and Lon) Is ...
3
votes
1answer
192 views

Interpolating Maps - Statistical Learning Techniques vs Spatial Statistics Techniques

I have recently begun experimenting with the inteprolation of variales over a whole country. I have good sized training set where I have several dependant variables (continuous and categorical) ...
6
votes
3answers
217 views

Classifying point coordinates to countries or continents?

I have about 50 000 points (latitude and longitude), and I would like to find out in which country each of the points is located. It does not need to be super precise, though. (Or actually I only ...
7
votes
2answers
173 views

How to create a solar intensity map for a garden plot?

I'm interested in creating a raster surface that depicts the average solar intensity per unit area for a small garden plot. I imagine the inputs into the model would be the following: Plot ...
4
votes
1answer
98 views

How to stack rasters for ecological analysis?

The attached image shows two different forest openings. Each opening has the following layers associated with it: Point shapefile 1 = A red X which represent a large "legacy" tree in the gap Point ...
5
votes
2answers
382 views

How to implement bivariate Ripley's K function in ArcGIS 10?

The attached image shows a forest gap with red pine represented as circles and white pine represented as crosses. I am interested in determining if there is a positive or negative association between ...
3
votes
2answers
63 views

Where can I get public transportation route information for USA?

I'm trying to find a list of public transit route information, mainly location of bus and train stops for the US. I've looked around at some of the Google products and openstreetmap but can't find ...
4
votes
1answer
301 views

book/tutorial on using rpy2 in python for kriging?

I am proficient in Python, but have no knowledge of R. Can you suggest a good tutorial in using rpy2 or any other R library to perform Block/Cokriging "Kriging"
2
votes
2answers
206 views

How to single out country data from a world data map?

Say that i have two "data sources"; A global map of average wind speeds, A shape file (or similar information) of all country borders in the world. How do i combine these two sources and extract ...
2
votes
2answers
431 views

How to create a map with states by attribute value?

I'm using Qgis, but I am quite familiar with R and python. So I could use any of these. I want a map of mexico but want to color the stats according to a certain variable. It goes from 0 to 100. So ...
10
votes
2answers
161 views

Count raster value in a bounding box (spatial extent)

I have simple question: given a bounding box, how can I count the number of specific values (say, I am interested in the number of value == 1 ) in a raster in 1) arcpy, or 2) raster package in R?
9
votes
1answer
256 views

How to visualize azimuthal data with uncertainties?

I am trying to make a figure showing azimuthal data with a different range of uncertainties at each point. This oldschool figure from a 1991 paper captures the "bowtie plot" idea that I'm aiming for: ...
6
votes
3answers
1k views

How to find and merge duplicate points?

I have two point shapefiles: Red and Blue. Each point shapefile has a z value which represents a radius (i.e. represented as buffers in the example). A duplicate point is defined as a point that ...
5
votes
2answers
362 views

rpy2 installation on Mac OSX. A still unresolved problem on StackExchange and rpy-list [closed]

following lgautier's advice on rpy2 installation on Mac OSX, I posted my request on rpy-list and got in touch with Yair Benita who said he could only install rpy2 through his default Mac OS X python ...
1
vote
1answer
303 views

rpy2 installation on Mac OSX

I'm desperatly trying and retrying to install rpy2 on my Mac OS 10.6 in order to run SDA4PP plugin on QGIS. My version of R is 2.14.0 and it was obviously compiled with the option --enable-R-shlib ...
5
votes
2answers
234 views

Using rpy2 in ArcGIS

I have a 3rd party python geoprocessing script that requires rpy2, and thus also r. What is the best way to get these working together? Using R with ArcGIS Desktop says the most useful option for ...
14
votes
3answers
509 views

Ecological geospatial conundrum

I am looking for a different, more elegant solution to a spatial statistics problem. Raw data consists of an x-y coordinate for each individual tree (i.e. converted to a point .shp file). Although ...
4
votes
0answers
405 views

How to get rpy2 for QGIS on OSX?

I am a new QGIS user, have installed QGIS on a Mac running Snow Leopard OSX 10.6.8 following all the instructions. QGIS seems to work well for everything other than when I boot up I get the message ...
3
votes
1answer
252 views

Spatial Interpolation Methods like PRISM

I am looking for some kind of software (free software) that allows me to make an interpolation like PRISM software. The interpolation used in PRISM is a local regression and accounts for ...
1
vote
0answers
258 views

Administrative level and coordinates from Yahoo GeoPlanet WOEID

The Yahoo GeoPlanet data can be freely downloaded from: http://developer.yahoo.com/geo/geoplanet/data/. If I understand it correctly, each WOEID corresponds to a unique location on earth, with ...
10
votes
5answers
603 views

How to implement value-by-alpha map in GIS?

I've been doing some background reading about cartograms recently and stumbled upon interesting alternative - value-by-alpha maps. Concept is described in more details here and full paper is ...