Hot answers tagged tools
15
I've been exploring SciPy's signal.convolve approach (based on this cookbook), and am having some really nice success with the following snippet:
from scipy import exp, mgrid, signal, row_stack, column_stack, tile
def gaussian_blur(in_array, size):
# expand in_array to fit edge of kernel, by repeating edge values
ny, nx = in_array.shape
ary = ...
12
Gaussian blur is just a weighted focal mean. You can recreate it to high accuracy with a sequence of short-distance circular neighborhood (unweighted) means: this is an application of the Central Limit Theorem.
You have a lot of choices. "Filter" is too limited--it's only for 3 x 3 neighborhoods--so don't bother with it. The best option for large DEMs is ...
10
In ArcGIS Desktop 9.3.1 and prior, right-click on the tool in ArcToolbox and select Edit Documentation. At version 10 it is a little bit different, this thread on Esri Support describes the issue: http://forums.arcgis.com/threads/405-Beta-10-ArcToolbox-Documentation
Specifically, at 10.0, you need to access the toolbox item from the ArcCatalog window within ...
8
Portable Python http://www.portablepython.com/
Interesting project you have will it be available to the GIS community?
Maybe of interest
Portable GIS
http://www.archaeogeek.com/blog/portable-gis/
8
To revert to the ArcGIS 9 editing environment: "The setting is found in the Advanced ArcMap Settings utility, located in the \Utilities directory where you installed ArcGIS." From http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Reverting_to_the_ArcGIS_9_editing_environment/001t00000013000000/
7
I'm not 100% clear on the effect you're looking for but... there is a geoprocessing tool called "Create Fish Net" that lets you create a grid of lines, and points, then you could use your polygons to clip the points.
For "irregular" you can use the "Create Random Points" which creates N points inside a polygon and you can specify a minimum distance between ...
7
I like Esri's ArcGIS API for Microsoft Silverlight/WPF, and also the ArcGIS Viewer for Silverlight.
You can use Bing with these, or base maps from ArcGIS.com.
Also, consider using SQL Server 2008 with Sql Server Management studio to prototype spatial sql queries. Isaac Kunen's blog is a good resource. Best when used with the Sql Server Spatial Tools from ...
7
Because even the Microsoft code is buggy, it may be useful to provide correct pseudocode for the conversion.
To convert decimal degrees x to degrees (d), minutes(m), and (decimal) seconds (s), do the following:
Declare d, m as integer, s as float
If x < 0, then sign = -1 else sign = +1
Let y = Abs(x) ' Work with positive values only.
Let d = ...
6
I think you have to rely on your file system for this information.
I've used openfiles from the command prompt to get this information from window file shares. You would need admin access to the actual server, so this might not be an option for you.
C:\WINDOWS\system32>openfiles
INFO: The system global flag 'maintain objects list' needs to be enabled ...
6
Within an Excel VBA macro, the following calls a Python script called test.py:
Sub test()
rsp = Shell(Environ$("COMSPEC") & " /c C:/test.py", vbNormalFocus)
End Sub
(Original source here)
I've forgotten how to run an ArcGIS VBA module, but perhaps a similar line would work to call your python script.
Another strategy that might work could be to ...
6
What you need is basically build topology for you vector layer. One option is using ArcGIS, convert your shapefiles to ESRI GeoDataBase, create topology using different rules defined in ArcGIS and then clean your data. Here is a short tutorial for the same.
Another option is using postgis and check for dataset validation. Here is a tutorial for this.In that ...
6
First, full installation of OSGeo4W:
http://trac.osgeo.org/osgeo4w/
Use the binary package(#1 under step 2).
Second, fetch the Sextante plugin for QGIS, and add it.
You should now be able to access the GRASS modules(I have currently 154 geoalgorithms).
Source: I used this over the weekend to perform various raster analysis operations, most of which ...
5
Hiring a surveyor a Mapperz suggests is probably the most sensible thing to do if you're committed to putting a lot of money into landscaping.
That said, see if there is LIDAR data available for your area. Some U.S. states provide it at an accuracy of ~18cm for free. It might be sufficient for your planning needs.
5
You are better off using a remote sensing application. Of course, you need to have the raster imagery on your computer. There are tons of methods that can help you determine woodland areas, such as: using Neural Networks, trained patches of imagery, supervised/unsupervised segmentation and classification. I'm not sure if this solves your problem, but it's a ...
5
This worked for me using ArcGIS 10 SP1. My custom tool is not on a toolbar:
Dim UIDCls As ESRI.ArcGIS.esriSystem.UID = New ESRI.ArcGIS.esriSystem.UIDClass()
' id property of menu from Config.esriaddinx document
UIDCls.Value = "ClassLibraryAddin_MyTool"
Dim document As ESRI.ArcGIS.Framework.IDocument = My.ArcMap.Document
Dim commandItem ...
5
Maybe Multitemporal Multivariate data visualization plugin for QGIS is closer to what you're looking for.
Screenshot: http://www.bernawebdesign.ch/byteblog/wp-content/uploads/2011/04/multiview.png
4
Expanded answer based on @petr k.'s accepted answer.
The example in the ESRI forum is using a URL, but I was able to knock out the src attribute and set the height to 0 in order to control my width: <iframe width="500" height="0"></iframe> In my case, I'm not concerned about the height of the window.
In ArcGIS 10, I selected the "As a ...
4
Great question Charles.
They are both. GIScience has a much bigger scope and depth. GIScience investigates better methods, methodologies to achieve something. For instance, developing an new algorithm to process remote sensing imagery and extract certain features.
GIS is a tool, used by others to achieve desired results. A GIS user uses certain algorithms ...
4
after obtaining the square grid, clip it with:
Vector>Geoprocessing Tools>Intersect
intersect it with the poligon.
4
It's not very complicated to do, but I tend to just use this webpage. But let's work through the latitude in your example. The decimal degrees are the same, in this case 41. Now, take the remainder and multiply by 60. This gives you
35.44998. The integer part is the seconds (35'). Now, take the remainder and multiply by 60 again. You get the seconds ...
4
Look this python library https://github.com/ewheeler/PyDecimalDegrees
or this online/offline scripts based on Perl http://www.movable-type.co.uk/scripts/latlong.html
4
I think an error like yours, seen when you try to Start a Geoprocessing Service either manually or as part of Add New Service (i.e. when it is first created), is likely to be due to trying to start too many Geoprocessing Services for the resources the hardware hosting them has available.
If you Stop one or two others then you should be able to Start this ...
3
@ MaryBeth - You have valid concerns, It probably is not ever going to be as easy to "draft" in arcmap as it is in autocad, or microstation, or "Their/Your CAD System Here".
*EDIT: * what's new
There are some SUPER nice features however that I am beginning to really love in desktop 10.
ESRI has come a long way to making or facilitating a (used to be ...
3
DIY Survey on the cheap is going to be either inaccurate (cheap equipment) or costly.
Ideal renting a viva gs09 rtk would be your best bet
http://www.surveyequipment.com/gps-survey-equipment/viva-gs09-rtk
(Requiring only the GS09 SmartAntenna and CS09 Controller)
Then you need the software to create your DTM.
The really dirty way is create a grid in your ...
3
It's possible to do this kind of work using close-range photogrammetry, which basically involves taking a lot of pictures and then working with them on a computer. Unfortunately, good software for this costs US$1k-$3k, and it takes some practice to use it well and to take the right pictures. It's a lot of fun, though.
3
It used to be called the job tacking extension. now it is work flow. Job tracking
This thing does some really cool stuff. however it is a $$ hit.
If you look on the arcscripts website I think there is a free "mini" mxd utility that does something like this.
3
I'm a complete GIS newb, but I came across this in the documentation:
You can make your script tools run faster by running them in process. This topic describes in-process execution.
3
To avoid the licensing pitfalls, you can grab plenty of Landsat TM5/ETM7 data from GLOVIS. Then, using eg bands 3 and 4 (red and near-infrarred), and possibly others, you can try to classify the image, export as a polygon and then tweak the polygon to your hearts' content. For forests, using the spatial correlation between pixels is often very useful (in ...
3
Perhaps try different source imagery. With OnEarth you can pick and choose among different band combinations. The pseudo or false colour ones highlight the differences between vegetated and non-vegetated areas better than the "natural" or "visual" colour combo (scroll down to WMS Global Mosaic use examples). The OnEarth data is available via TiledWMS, KML, ...
3
One interesting distinction that Michael Goodchild has noted is between GIS and statistics: many modern statistical methods were developed in the nineteenth century, but were difficult and costly to compute by hand. Only with the advent of the personal computer did the costs fall sufficiently to enable widespread use of computationally expensive statistical ...
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