10 votes
Accepted

Opening old QGIS model in current QGIS versions

Processing in QGIS 3 was refactored a lot and many algorithms were changed. So it is not possible to covert old models into new format. You need to recreate it. says Alexander Bruy, QGIS contributor, ...
7 votes

Are there open source solutions for travel demand modelling?

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 ...
6 votes
Accepted

Why TauDEM specialized tools (e.g. D-Infinity Distance Down) are only available with D-Infinity flow model?

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 ...
5 votes
Accepted

Testing species distribution model residuals for spatial autocorrelation?

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) ...
4 votes

3D subsurface modelling

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 ...
4 votes
Accepted

How to calculate the impact and extent of damage of a potential tailings dam breach with ArcGIS?

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 ...
  • 56
4 votes

Flow Accumulation Python or MATLAB Script

You might want to have a look at these Matlab functions http://www.mathworks.com/matlabcentral/fileexchange/50124-topotoolbox More specificaly, you can generate a flow accumulation matrix using DEM ...
4 votes

How to create a sound map using ArcGIS?

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 ...
  • 3,803
4 votes
Accepted

Getting Negative values in Regression based Biomass model!

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 ...
  • 1,156
3 votes

Flow Accumulation Python or MATLAB Script

David Tarboton does a good job of breaking it down at http://hydrology.usu.edu/taudem/taudem5/help53/D8FlowDirections.html basically as does Jenson. Jenson, S. K., and J. O. Domingue. 1988. "...
3 votes

Spatial resolution for Bioclim datasets

The finest resolution of Bioclim is 30 arc-seconds, which translates to approximately 1 kilometer (1000m). You can certainly resample the data to 30 meters but this would be quite invalid because ...
3 votes
Accepted

Building DEM of large areas

Depending on your image type you can use Esri Raster Mosaic dataset - have your tiles and mosaic too without any (much) extra storage. The mosaic dataset works like a VRT file where the rasters are ...
3 votes

Are there open source solutions for travel demand modelling?

I also recommend TRANUS. Its a complete land use model and a detailed transport model, in which modal split and assignment are in one integrated process based on logit. It may be applied to cities or ...
3 votes

Is there a SWAT model integration for QGIS?

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.
  • 163
3 votes
Accepted

Open Source GIS tools for using LiDAR to estimate storage behind dams/culvert

You could also consider using GRASS-GIS to import and process your LiDAR data. There is detailed information provided on the GRASS Wiki and an example of a DEM created and visualised included below. ...
  • 4,782
3 votes

Error: could not find the function crs

First message error: setting coordinates cannot be done on Spatial objects, where they have already been set You can't set coordinates again if they are already set. Second message error: ...
  • 12.3k
3 votes
Accepted

How to calculate the shortest path of adjacent points, from an origin to destination points? (ArcGIS Pro/ArcMap)

The correct way to perform shortest path is to use Travelling Salesman algorithm, ( as per FelixIP comment) - which has been implemented in ArcGIS in the Network Analyst extension. https://desktop....
  • 2,953
2 votes

Variogram model fit compatability among geoR, gstat, and nlme packages in R

I see a different output, namely: > m2 <- update( m1, corr = corExp(c(300, 0.7), form = ~ x + y, nugget = T) ) Error in lme.formula(fixed = log(zinc) ~ 1, data = meuse, random = ~1 | : ...
2 votes

Is there QGIS plugin to allow 3d visualisation of geological borehole data similar to functionality of Target for ArcGIS?

This is an old question but, for anyone who finds it today, it might be useful to know that you can use the "Qgis2threejs" plugin to plot boreholes in 3D. You may also use the "Midvatten plugin for ...
  • 151
2 votes

Choosing R package for discrete choice model?

This looks like a multinomial regression problem to me. I.e, a logistic regression with more than two choices. Say, choice ~ income, age, zip code, distance to next bus stop, ..... and choice being ...
2 votes

How to make input data in MaxEnt with several occurences at the same coordinates?

Maxent is supposed to predict probability of presence due to the co-variates you are testing (usually environmental variables). It is a presence only model and is not an abundance model so I really ...
  • 2,156
2 votes

Modelling soil texture using ArcGIS for Desktop?

If you go to this site (I did nothing more than a simple Google search) there is an online calculator. Right at the top is a link to an Excel file this appears to contain all the logic you require to ...
  • 40k
2 votes
Accepted

Identifying the best OLS regression model

You should use "Exploratory Regression" tool which is a tool inside a complementary toolbox called "Supplementary Spatial Statistics". you can define many criteria for a passing model including R-...
2 votes

ArcGIS 10.2 Model Builder, getting results to 'add to display' when running as a model tool?

Try making the output a parameter and then it should add it to the display when you run the tool from the toolbox.
2 votes

Open Source GIS tools for using LiDAR to estimate storage behind dams/culvert

You have a LiDAR derived surface model and you want to calculate the volume of water that would be behind a theoretical dam? If so, have a look at this link http://www.bc-consult.com/tut/QGIS-volumes....
  • 7,637
2 votes

How geotiff converted to 3d model?

A quick search on the internet, I found that there are many tutorials available to show how to import raster DEM in Blender: How to Download and Import a Real World Terrain in blender (Youtube) ...
  • 36.7k
2 votes

How to delete multiple columns in the QGIS processing model?

You can use Refactor Fields, as part of your model.
  • 905
2 votes

Extract by expression - N first

Use this expression: array_foreach ( -- iterate over all entries for each value of the series created in the next line generate_series ( 0 , 9 , 1) , -- generates a series from 0 to 9 with ...
  • 45.1k
1 vote
Accepted

Airborne Smell Modelling

You may want to try ALOHA from NOAA. They have data and feeds for a variety of meteorological factors. ALOHA calculates wind plumes.
  • 2,240
1 vote
Accepted

What methodology is used to quantify global warming?

The analysis is done by the Goddard Institute for Space Studies. You can find more information on the methodology at the GISS Surface Temperature Analysis (GISTEMP) website.

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