The act or process of planning or writing a computer program.
0
votes
1answer
60 views
Efficient algorithms for recovering watershed boundaries?
This is somewhat related to a previous question I asked:
What Algorithm is used by ArcGIS Watershed tool?
I was wondering if there is a more efficient way to calculate catchment areas if you are ...
3
votes
1answer
48 views
What's an appropriate solution for displaying points fetched from a table?
I have at hand a common GIS task:
The data: I posses 16,000 Excel rows. Each has latitude and longitude and some other attributes. I need to build a program that allows the user to type in a location ...
0
votes
0answers
48 views
Building real-time point/polyline connection in GIS
In the first instance I need to create the network by constructing the basic elements, the nodes and links. This is relatively easy work as SharpMap has provided geometry tools that allow users to ...
1
vote
1answer
25 views
problem with arcgis Sample : Custom vertex editing commands
please i downloaded this sample :
http://help.arcgis.com/en/sdk/10.0/arcobjects_net/conceptualhelp/index.html#/Sample_Custom_vertex_editing_commands/0001000002pz000000/
it's a Dynamic Link Library.
...
0
votes
0answers
43 views
Can QGIS be used to develop a vectorization tool?
First off, I don't now the lingo so forgive me if I can't phrase this question using the appropriate language.
I am thinking of writing a c++ program that can convert a simple "color map", that is a ...
0
votes
0answers
50 views
Why doesn't this simple OpenLayers code work?
The problem is that when I create a new shape and add it to the layer and programmatically select the new shape, I cannot unselect that shape using the mouse unless I either click the shape or click a ...
0
votes
0answers
18 views
Programmatically download NED, Landcover, etc. data from USGS [duplicate]
What are my current options for downloading geodata (NED, landcover, etc.) from the USGS programmatically?
1
vote
1answer
19 views
Link two Google Earth frames to mirror each other
I have a webpage with two Google Earth Frames side by side. Is there a way to link the two together so when I zoom or pan in one frame, it is mirrored in the other? Thanks.
4
votes
2answers
409 views
How to efficiently determine if a collection of coordinates (polygon) is an ellipse?
I'm attempting to determine a geometry type based on a collection of coordinates and have come across a situation where I'd like to differentiate between what is a "polygon" and what is an "ellipse". ...
3
votes
3answers
115 views
programmatically add field to shapefiles and insert shapefile name in every row of field
situation
We have a folder containing 1 sub-folder for every participant in a study. The subfolders are named with the participants' ID, e.g., 1000, 1001, 1002, 1003. Every participant folder ...
0
votes
1answer
50 views
Openlayers selection
Is it possible to select a polygon from a predefined Lat & Lon programmatically?
eg location point: x='1234' y='5678' intersects polygon '1234', therefore SELECT POLYGON '1234'
So far I have ...
0
votes
1answer
40 views
Finding points in extent using VBA
Is there a way to select a point from my map's current extent? I want to use ArcObjects to tell me if there is at least one point visible in my extent. I'd like to do this entirely in VBA, and without ...
2
votes
2answers
516 views
What language (or languages) are the next 'big thing'?
Having (mostly) learned how to navigate Python programming in GIS, I've gotten to thinking about where GIS programming is going from here. I know VB used to be the go-to language for ArcGIS, but that ...
10
votes
8answers
2k views
What programming languages are used by different GIS platforms?
Suppose a programmer has no knowledge of GIS, but wants to leverage his/her programming skills to get into GIS. Please list different GIS platforms, packages, etc. that use a particular language.
(I ...
0
votes
0answers
128 views
What is the easiest way to calculate borehole deviation?
Does anyone know if there was a program or specific method (calculations) in order to create a deviation value based on querying specific geological and drilling variables?
1
vote
2answers
587 views
How to add a polygon from GeoJson into Leaflet?
I try to use the following function to add polygons to my Leaflet map.
function polygon(geojson)
{
alert(geojson); // alert for testing
layer = L.geoJson(geojson);
layer.addTo(map);
}
...
8
votes
2answers
252 views
Instructor led Web mapping development courses?
Hey guys I have been messing around with programing for a while now and have gotten proficient with Python and have some interest in HTML 5 and Javascript. I have recently received a request for an ...
3
votes
1answer
103 views
Learning resources for beginning differential topology for a programmer? [closed]
With this question I'm looking for suggestions about how and where to start learning differential topology starting from a good base of linear algebra and geometry, also consider that this know-how is ...
2
votes
0answers
75 views
Custom python datasource to QGIS
I'm working on a homebrew spatial feature data format, and using Python to write it's API.
It occoured to me that use some tool like QGIS to display my data would be very nice to have, for debug/test ...
5
votes
1answer
141 views
Grid Analysis from samples data
I'm trying to analyze set of samples into vector grids in order to generate average data in corresponding grid.I'm working with 50m separated grids but the size of grid may change over time.That's why ...
2
votes
1answer
55 views
Should I use thread lock when implementing Enabled void in ArcGis Command?
I've noticed that that ArcGis Commands are activated asynchronously. So I supposed that there is a chance to corrupt memory without using thread locks when overriding Enabled void of custom ArcGis ...
2
votes
1answer
32 views
Is it better to define object properties or layer properties?
I have a question, but it is difficult to phrase. I am picking up GIS methods as I go, and I have run into this problem frequently. Please excuse me if I am in the wrong place.
When organizing ...
1
vote
1answer
43 views
Prompting Dialogue Box to Have User Enter Information? Without ArcGIS Engine maybe?
Working with the ArcGIS family v10.1 on Windows 7.
So, I have this vision for a GIS project that does the following:
User opens up ArcGIS Explorer (ideally) or ArcMap (still fine), or I guess even ...
1
vote
1answer
164 views
Undefined reference errors installing GRASS addon
I am trying to install the r.geomorphons GRASS addon (available from http://sil.uc.edu/pdfFiles/jarek/r.geom.zip) in GRASS. I tried on Windows but gave up and decided the best thing to do was to try ...
6
votes
2answers
2k views
Generating GeoJSON with Python
Hi I want to programatically create a GeoJSON file using polygons from a shapefile but adding attributes from my own application.
This is easily done for a shapefile:
def ...
2
votes
2answers
307 views
Insert a loading message into DataGrid
I'd like to show a loading message (Loading...) that shows while the datagrid is being populated.
It would show when the search button is clicked and disappear when the grid results have populated.
...
8
votes
3answers
662 views
Map Application Requires Refresh to Initialize
I tried this question over on StackOverflow but didn't get any answers. Hoping you all might be able to help.
Creating a web mapping application in Javascript/Dojo:
When I load the app in a browser ...
2
votes
2answers
671 views
[R]Function to calculate mean for missing or NA values in a dataframe
I am trying to develop a function that will calculate a mean lat/long for my missing or zeros location (lat/long) data in my dataset.
I have locations for many SETS within the same TRIP, which tends ...
1
vote
0answers
101 views
Delphi coders: what features should a GIS d/b interface VCL component have?
If someone were to implement a VCL component to interface Delphi applciations with GIS databases such as PostGIS and Spatiallite, what features and functionality would be "must have" and "nice to ...
4
votes
1answer
636 views
How to programatically populate a shapefile field with polygon areas in OGR?
I'm trying to programatically populate a shp field with polygon areas:
import sys
import ogr
ds = ogr.Open( 'tttttttttt.shp', update = 1 )
if ds is None:
print "Open failed./n"
sys.exit( 1 ...
3
votes
1answer
430 views
Calculate bounding box + buffer for rendering a map tile with mapnik library
Mapnik library has a Projection object (I'm using Python bindings):
spherical_mercator = '+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null ...
4
votes
1answer
701 views
merge selected features and programming
I have a shape file with UK districts and unitary authorities. In the past, using commuting patterns, I worked out a new geography which is close to travel to work areas.
I now would like to create a ...
1
vote
2answers
2k views
Some Help to select some features from a vector layer
I have a vector layer (kml) that has some point with scientific name of plants and animals, some description of the place where the people saw them and the coordinates.
Basically the table associated ...
6
votes
1answer
144 views
Phenological event extraction in IDL
I’m doing phenological study using threshold method in IDL. I have a twelve-band image in 2005 (format is in .tiff not ENVI format). Twelve-band means that monthly images (Jan to Dec) have been ...
4
votes
1answer
238 views
Finding intersection density for weighted lines connecting points across the continental USA
I'm working on an one-time problem that I'm hoping to solve with a computer program using free GIS libraries (preferably for VB.Net, C#, or Python... Java or C/C++ could work too). Alternatively, I ...
5
votes
3answers
293 views
What types of GIS problems does functional programming address?
After reading @ray vernagus post about using ArcObjects with F#, I have been wondering ... what types of GIS problems are better handled by Functional Programming, as opposed to more traditional forms ...
1
vote
4answers
502 views
GIS learning resources for a .NET developer
There are couple of questions which are related to learning GIS or GIS skill sets here but I would like to ask very specific question.
My current skills: I don't claim that I am a good programmer ...
7
votes
2answers
437 views
Is it a bad idea to hold references to ArcObjects inside business classes?
According to best practices is it a bad idea to cache features and geometries inside business objects? If it is bad, what is the alternative way?
References to features may be replaced with their ...
4
votes
0answers
248 views
How to convert a set of points to a solid object?
I have a data generated as the output of some numerical processes. I need them to be converted into 3D solid objects (as CAD solid format) to make them importable for some particular numerical ...
7
votes
1answer
137 views
Using Google Maps to track work per building and allowing users to manipulate that data
I work part time for a political campaign office, who are going door-to-door for several months at a time, all over a city. We need a system to track where we have been, and how long ago we were last ...
2
votes
2answers
275 views
flex to java trying to get started on the plan
I have as suggested recently on this forum been "playing" with arcgis server. For reasons perhaps not obvious to "real" programmers I have built a fairly extensive series of web mapping applications ...
6
votes
3answers
234 views
What is the more accepted practice for defining tolerance values?
The Context
Due to restrictions, I have an application that requires line features to be selected if they are within a user defined tolerance from a points data set. I can not currently use any third ...
2
votes
1answer
125 views
Locate DTEDs from one layer that intersect a polygon in another layer
I'm new to the GIS world, and using ArcGIS 10, so please forgive me if this is a simple question. I have DTED files (level 2) that I have placed into a mosaic dataset, and I'm trying to determine ...
3
votes
1answer
173 views
Self-Sizing Labels
I have labels now in my application that work fine using the usual ILabelEngineLayerProperties2. When I set them up I set the .Expression property and using the .Symbol property I set the font, style, ...
3
votes
1answer
350 views
Georeferencing multiple rasters to World files
I've got exactly 56 tiffs to georeference. Each raster has its unique TFW world file. I'd like to automate this process. Each raster has it's unique name which is consistent with world file name (eg. ...
11
votes
8answers
2k views
What are the advantages of using Rails for a GIS/mapping application?
I've heard some good things about Rails, but I don't know much about it yet. There are only a few questions about Rails on GIS.SE (and there's not even a Rails tag).
Is it worthwhile to learn about ...
6
votes
3answers
644 views
Add map making to java desktop software
In my project (a desktop application) I need to create a map with three layers, basic geographic layer at the bottom, a GSM coverage area layer on top of it, and then a location based services layer ...
18
votes
5answers
1k views
Looking for a developer-friendly web gis
I'm a recent Computer Science graduate who prides himself in his knowledge of software development and problem solving, but has no idea how gis systems work.
(Read: I'm a programmer)
I've been ...
0
votes
1answer
166 views
Where to get raster files of Earth, united states [duplicate]
Possible Duplicate:
Open access repository of general GIS spatial data?
I'm brand new to GIS programming so please excuse my lack of knowledge.
I am developing a GIS web app using ...
5
votes
1answer
342 views
Combined area of all features within features of another layer
I have a grid shapefile (basically, a half-degree grid of the world, where each cell has a unique id number), and a set of files with features. I want to record for each grid cell, all the areas ...
