Can I use django.contrib.gis on GAE?
Can I use GeoDjango with GAE / BigTable? ...
gis
Where is my python script spending time? Is there "missing time" in my cprofile / pstats trace?
I am attempting to profile a long running python script. The script does some spatial analysis on raster GIS data set using the gdal module. The script currently uses three files, the main script which loops over the raster pixels called find_pixel_pairs.py, a simple cache in lrucache.py and some misc classes in utils.py. I have profi...
How to Add a Dynamic Layer to an Esri Map Control Programatically in WPF?
Just as the question asks. I have an Esri map control and want to add a Rastor image to the control in WPF and don't know how to do it. I see that I can add layers to the Map control, but is there a way to add a Raster image to a map control? I did find this code to turn the raster image into a Dynamic layer, but Im still lost on how ...
Break up a polygon into smaller ones
Hi, I am working with geodjango and I want to breakup a 2D Rectangular Polygon into smaller ones. My input is a big rectangle and I want to subdivide it in smaller rectangles. The sum of the smaller rectangles must be the original rectangle. All subrectangles should be equal size. How can I do that? Thank you. ...
Nearmap architecture
Looking at http://www.nearmap.com/, Just wondering if you can approximate how much storage is needed to store the images? (NearMap’s monthly city PhotoMaps are captured at 3cm, 5cm, 7.5cm, or 10cm resolution) And what kind of systems/architecture is suitable to deliver those data/images? (say you are not Google, and want to implement t...
R Tree 50,000 foot overview?
I'm working on a school project that involves taking a lat/long point and finding the top five closest points in a known list of places. The list is to be stored in memory, with the caveat that we must choose an "appropriate data structure" -- that is, we cannot simply store all the places in an array and compare distances one-by-one in...
Is this feasbile with GIS?
I'm just getting myself to familiarize with GIS but i like to know before hand if the following is feasible with current GIS apps/tools... I get the point for an address by geocoding. Easy part. Now if the point falls within a boundary (may be a city/county/state) then i need to get the data (any id/flag) associated with the boundary. ...
Java Simple WGS84 Lat Lon to Pixel X, Y
I've read a multitude of information regarding map projection today. The amount of information available is overwhelming. I am attempting to simply convert lat, long values into a screen X, Y coordinate not using any map. I do not need the values projected onto any map, just on the window. The window itself is representing approx. a 1...
Which applications use R-Trees?
Besides GIS applications, which other applications or libraries use R-trees and its variants? ...
draw geotiff in a JFrame
Hi: However I found that some geotiff image can be displayed in a JFrame,however others can not. The core codes: PlanarImage resultImage = null; InputStream is = null; try { is = new FileInputStream(new File("D:/wu.tif")); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } ...
Manipulation with GIS content on the web using the WebGL
I have task to create program for manipulation with 3d content on the web. When I said 3d content i mean on 3d map (witch i have and it is something like *.sdm) which i should load into browser and work some basic operation with it (rotate screen, change camera etc...). Because i am totaly n00b i want to ask a couple of questions: 1. H...
Geographical ontologies ready to use?
Hi all, I'm looking for an ontology containing geographical knowledge. In particular I'd like to have these types of information: political states / regions / cities / city areas geographical regions (e.g. continents, name of mountains, lakes, etc) For example, starting from the node "New York" I'd like to be able to find parents li...
Converting from Latitude/Longitude to Cartesian Coordinates with a World File and map image.
I have a java applet that allows users to import a jpeg and world file from the local system. The user can then "click" draw lines on the image that was imported. Each endpoint of each line contains a set of X/Y and Lat/Long values. The XY is standard java coordinate space, the applet uses an affine transform calculation with the worl...
huff model in gis
hello all, how would be the simplest version of the Huff model for territorial and economic analysis? sig using algorithms that I recommend or free libraries for working with files both vector and raster OGR ...
what is the diffrence between GIS and GPS?
Hello every one Is GPS one of the application of GIS? And is there any sw create gps for a specific location ( I determine it)? thank you ...
what is common GIS method?
hello every one I want to know what is the main methods that used in GIS to connect between the location and their information (spatial access methodes) SAM. I read in some web sites two methods are: vector raster is that methods related what I want??? thank you ^_^ ...
What is the difference between Multiple R-squared and Adjusted R-squared in a single-variate least squares regression?
Could someone explain to the statistically naive what the difference between Multiple R-squared and Adjusted R-squared is? I am doing a single-variate regression analysis as follows: v.lm <- lm(epm ~ n_days, data=v) print(summary(v.lm)) Results: Call: lm(formula = epm ~ n_days, data = v) Residuals: Min 1Q Median 3Q...
Why does UMN-Mapserver shows an ERDAS Image-File (.img) as white shape?
I want to render an ERDAS-Image-file (suffix .img) with the UMN-Mapserver. The data is rendered on the right position and with the correct shape, but all data is white instead of an raster-image. The Image contains many layers. My mapfile looks like this: MAP NAME "Test" WEB METADATA ...
Google maps: place number in marker?
How can I display a number in the marker on a google map? I want to do server side clustering and I need to display how many points the cluster represents. ...
standard geographic tilizing/binning method?
I'm trying to learn and understand more about mapping and displaying values on a map. (GIS) At the moment I'M looking to take some values and apply those values to a tile or bin on a map. Ideally I'd like the tile sizes to be uniform, like 100 meters, 500 meters, etc. Is there a standard method for creating uniform tile sizes? Or Are ...