12

The short answer is that there isn't one especially if you're looking for a TransCAD or Emme/2 alternative as there is no open source package that comes close to those. The closest you can get are some micro modelling solutions like Transims or matsim that I find lacking of a lot of needed data, methodologies, tools, or network handling that are available ...


11

Yes, it is possible but using a Python script in the console see For geologists: 3D geological boreholes I presented the scripts in visualizing 3D data (Z values) or data with z attribute: a solution or QGIS, représentation 3D des couches vectorielles (shapefiles dits 3D ou shapefiles avec attributs z) avec les modules Python Matplotlib ou Visvis à ...


8

This book isn't specifically about data modeling, but I have found it particularly useful for working with spatial data in SQL Server. http://www.amazon.com/Beginning-Spatial-Server-Experts-Voice/dp/1430218290 There is also a newer book that will be more advanced and focused on SQL Server 2012, but I haven't looked at this myself yet. http://www.amazon....


7

Use focal statistics instead of block statistics: when using rectangular neighborhoods this produces the same results in the centers of the blocks, but focal stats are computed with moving (overlapping) windows, effectively creating a representation of a surface of relative slopes. Moreover, focal stats can be computed with more natural neighborhoods, such ...


6

Mostly this is a matter of implementation. They have not been implemented. Typically, each tool was historically developed in for a specific project or purpose and this development process has not resulted in complete consistency in the functionality available. I think all the algorithms would make sense with D8 too. Two of the tools (DinfAvalanche, ...


5

You could try Flowmap. It is specially designed to analyse flow patterns. You can find it here: http://flowmap.geog.uu.nl/


5

If money is not an issue then Enterprise Architect is the tool you are looking for. If you need it to be free, you can check out Humboldt's Geomodel Editor. Both have support for spatial data types.


5

As soon as you change the spatial resolution of a raster, you are resampling. If you want to keep exactly the same values as in the input data, you can use the "nearest neighbour" method.


5

Given an inevitable nonparametric model structure, a residual in the traditional sense is not possible. You could approximate the response, Pearson's or deviance (likelihood ratio chi-squared) residual error using standard methods found in the logistic regression literature, eg., response = [y - y-hat], Pearson's = [(y - y-hat) / sqrt(y-hat)] where; y = ...


4

Geomodelr might be what you are looking for. Geomodelr allows you to create cross sections from boreholes, or use geophysical data in the form of images. For geophysicists it's particularly cool because you can download your models and use python to query them, so you can couple them with your simulation tools. It's also pretty good for students, because it'...


4

I'm currently working with Vue Infinite 10.5 to bring in real-world elevation and point location data, and it hasn't been easy. Vue is a high-end 3D scenery solution used extensively by Hollywood. We chose it because it is capable of producing photo-realistic 3D visualizations at a reasonable price (about $1000 USD) and it has a Python API. Vue doesn't ...


4

There is a new option as well, which is AequilibraE, working as a plugin for QGIS (I need to disclose that I am the developer of it). It much less powerfull than TRANUS, but it is completely written in python and cython.


4

I have encountered some papers and talks on this and related field through my work on Risk Analysis, the journal of the Society for Risk Analysis. The most relevant recent paper is A Risk-Based Approach to Setting Priorities in Protecting Bridges Against Terrorist Attacks. Risk Analysis Volume 24, Issue 4, August 2004, Pages: 963–984, Maria Leung, James H. ...


4

This looks interesting: "ACTIVE VS. PASSIVE DEFENSE AGAINST A STRATEGIC ATTACKER" (their caps, not mine). While it doesn't explicitly address GIS, it seems like spatial analysis could be used in determining the vulnerability component of the model.


4

The short answer is 'yes'. In both QGIS and ArcGIS, you want to use the raster calculator. Each has its own syntax so check the documentation (see links below) for which ever one you are using. However, essentially, you can type a formula in the raster calculator along the lines you need. You can also use the raster calculator to do "mapematics" (...


4

There are quite a number of steps and additional data that you'd require before you can answer this question with a level of detail that is appropriate for such an important question. This is not just a question of emergency response, as it might first appear, but of rapid inundation which can cause a significant hazard to a wide area. Note: I am a flood ...


4

Well, I don't know if there are any standard out of the box ArcGIS tools set up for sound modelling, and I know sound-waves do have different properties than light waves that may affect your modelling (ex: echo/reflected sound), but there are out of the box tools for modelling line of sight from given point(s) that may work for what you need. Take a look ...


4

The crux is most likely in the fact that you are using a MLR, as this method can indeed result in values below 0, while a negative biomass obviously does not exist in real life. As for the statistical background, values below zero are caused by the combination of your predictors (independent variables). Where the outputs are below 0, your predictors in ...


3

The OrbisGIS (http://www.orbisgis.org/) noise map plug-in is a scientific computation core to quickly evaluate the noise impact on European action plans and urban mobility plans. This model is based on the French standard method NMPB2008. It includes traffic-to-noise sources evaluation and sound propagation processing. It is currently a 2 dimensional ...


3

Sue Greenlee's original code - that Esri's and many other watershed codes are based on - was published in FORTRAN in 1988. I'd go looking for that - don't see it on the web - but you could always email her! Kind of surprised it's not in GitHub, it's pretty neat code. Jenson S. K. and J. O. Domingue. 1988. Extracting Topographic Structure from Digital ...


3

Instead of proposing a different approach to the USLE, here is how to calculate changes in slope. 1 - calculate slope in degrees 2 - calculate slope in percent using the output of step 1 as your input While calculating slope from elevation data would give you percental changes in height, using a slope map as your input will result in percental changes in ...


3

The original USLE assumed little slope curvature and no deposition. To account for flow convergence in complex terrain, modifications were made to the LS factor with an equation that incorporates flow accumulation. Because they are now used interchangeably, when you see reference to slope-length most likely it is in reference to the LS factor, as calculated ...


3

I understand Arc 10.1 includes Empirical Bayesian Kriging (EBK) with the Geostatistical Analyst. See the attached links for more detail. EBK thread EBK info Edit: Additional ArcGIS algorithms using Bayesian Statistics and/or decision rules Maximum Likelihood Class Probability


3

I would suggest to visit the LADM Wiki: http://wiki.tudelft.nl/bin/view/Research/ISO19152/WebHome Here you will find the complete LADM documentation, and the UML model. Another suggestion is to go to: http://flossola.org/ Here you will find open source software and a lot of documentation (data dictionnary included). Further developments can be followed ...


3

try to download document for LADM as pdf. you will get different country profiles from LADM. try to fit your requirements which ever suits you most.


3

I have created this function as a PostGIS implementation of the travel time model. Improvements and suggestions welcomed. create or replace function public.brabynskellytraveltime( /* this is an implementation of Brabyn and Skelly's travel time model for New Zealand road networks. 1. Brabyn L, Skelly C. Modeling population access to New ...


3

You can build 3D Geological Structural and Property Models using Mathematica. I developed these scripts to make geological modelling available to a wider audience. Mathematica also works with many GIS and CAD formats. This makes it easy to construct models using information from multiple sources. Further details are available on the UNSW Connected Waters ...


3

TLDR: Combined Arms doctrine renders terrain defense moot. This area of study is referred to as terrain defense doctrine. The modeling you are proposing is possible, but would almost always return no result if the attack vectors are modern (air). Because terrain is rendered moot if you can fly. This type of modeling is usually only considered against ...


3

You could try using a PostGIS database with topology data type and functions. QGIS also has some topology functionality built in - this could be used if you're looking to have a desktop front end to your platform.


3

A beta version of QSWAT was released here. According to the mentioned requirements, QSWAT currently runs with the 32-bit version of QGIS 2.6.1 on Windows.


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