17 Questions 42 Answers 0 Followers
Questions related from Gianmarco Alberti
I am wondering if there is any package in R containing function(s) to perform viewshed analysis. I am not interested in packages that need the underlying presence of ArcGIS or GRASS; I am looking...
02 February 2018 10,031 4 View
As per title, I was wondering how in a DEM (i.e., a bare-earth DEM) one can locate depressions that are deeper than the surrounding ground by at least a given value. The main issue is that, quite...
10 October 2017 5,306 9 View
Hello. I have a point shapefile representing the location of weather stations; for each point, the wind speed and wind direction (in degrees) is recorded. I need to create a cotninous surface...
04 April 2017 753 9 View
Hello. I have been reading some interesting articles, in which navigation least-cost paths are calculated for some study areas. For instance: Leidwanger, J., 2013. Modeling distance with time in...
03 March 2017 4,185 3 View
Hello All, as per title, I am rather confused as to using slope raster in degree or percent when implementing Tobler function in GIS. Some sources (A, B, C) seem to point to slope degree, while...
01 January 2017 422 23 View
Hello, I am very familiar with producing isochrones maps in ArcGIS by implementing Tobler's hiking function. I was wondering if anyone here is familiar with QGIS' r.walk module which is used to...
12 December 2016 7,449 5 View
In Logistic Regression (as in regression in general), when it comes to check model's diagnostics, one has to check for observations with higher-than-average leverage. From what I read in several...
09 September 2016 2,754 3 View
I was wondering if anyone has ever come across ceramic disks from prehistoric contexts, huts in particular. By ceramic disks I mean sherds from pots' wall, reworked in such a way to eventually...
05 May 2016 9,206 26 View
I have a aerial photo which is slightly oblique. I would like to use a free program capable to rectify images; this should be a preliminary step toward georeferencing the picture. Many months ago,...
03 March 2016 8,953 7 View
Hello, I was wondering if anyone could shed light on an issue I am experiencing with the package cvAUC (link provided below). I wish to get the function cvAUC to work, yet I am not getting the...
12 December 2015 4,779 4 View
As per title, I was wondering if anyone is aware of any (free access) raster or vector GIS map charting the distribution of natural vegetation in sicily. Thanks for any hint you will provide. GmA
04 April 2015 5,358 1 View
Hello! I am wondering what Journal could be potentially fit to publish the (preliminary) achievements of a research of our. Our study has been aimed at modeling the relation between land...
11 November 2014 8,033 2 View
Hello, while I am familiar with binary logistic regression and with its mechanics and interpretation, I am going to approach multiple LR for the first time. I would like to know if anyone knows of...
11 November 2014 5,049 6 View
Hello, I made a search on the web, and I have spotted some publications. Nonetheless, since my knowledge of the topic is less than basic, I would appreciate if anyone here could put me in the...
10 October 2014 5,958 8 View
Hello, As per title, I am wondering if is it possible to find on the web a free resource for GIS shapefiles (georeferenced) of the Mediterranean basin, or even of the whole Europe and northern...
10 October 2014 9,660 10 View
Hello. I was wondering if anyone knows about the availability of free data on tides and currents in the Mediterranean area. In particular, I am interested in south central Mediterranean (Sicily...
09 September 2014 8,282 11 View
Hello, I am conducting a study that aims at modeling the relation between land agricultural productivity and environmental/topographic variables in a territory in the central-southern sector of...
07 July 2014 4,147 15 View
