Skip to main content

Questions tagged [species]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
1 answer
42 views

How do I calculate kernel density home ranges of animals in QGIS?

I am trying to calculate the kernel density home ranges of some animal occurrences in QGIS. I found the following website with a model, how do I import it and run it in QGIS? https://plugins.qgis.org/...
MapDeath's user avatar
  • 343
0 votes
0 answers
46 views

How to resolve "Error in PGOcc(occ.formula = ~Vegetation + Distance_National_Park + Distance_Shore + : c++ error: dpotrf A.alpha failed"?

I have been trying to using the spOccupancy R package for occupancy modelling to map an endangered species range. My data is formatted as follows: List of 4 $ y :'data.frame': 93 obs. of 3 ...
Birdman's user avatar
  • 61
1 vote
1 answer
41 views

How to to find out what species are in each cell? [duplicate]

I have a polygon layer called grid_trt which consists of about 100 cells. There is a CSV layer as observation, which contains GPS coordinates and some information about 2500 species in the form of 25,...
Sina Kh.'s user avatar
  • 153
5 votes
2 answers
187 views

QGIS: Compare two concatenate fields and add similar strings to new column

I am doing research on how planned improvements in urban green will likely affect biodiversity using QGIS. Each form of urban green has a list of so-called references species, species that are ...
Sebastian's user avatar
3 votes
2 answers
307 views

How to identify all species observed in each cell of a research grid

I have created a grid map as a shapefile. I have added a point layer that includes “species name”, coordinates and etc. I put a part of it below. Now, My problem is, when I use “count points in ...
Sina Kh.'s user avatar
  • 153
1 vote
2 answers
802 views

Creating survey form for Qfield for inputting flora species (and quantity) and in zones

I have been using QGIS off and on for a few years but only for basic stuff. I need to design an easy to use form within Qfield for the botanists to use. We need to survey flora species (>300) of ...
Island Lescure's user avatar
1 vote
0 answers
200 views

How can I remove small polygons left of a layer after using Erase tool in ArcGIS Pro? [closed]

I am new to more advanced use of ArcGIS Pro. My case involved cutting unnecessary parts of an IUCN range map of amphibians (I need only parts of ranges in Europe excluding Turkey and Eastern Russia). ...
Ema95's user avatar
  • 11
0 votes
0 answers
310 views

Trying to make a fish diversity map using ArcGIS 10.7.1

I'm relatively new using ArcGIS. I want to make a fish species richness map (or fish diversity map; essentially tells you how many fish species are in each grid cell). Things I did so far: Obtained ...
Xin 's user avatar
  • 11
0 votes
1 answer
211 views

Color grid if values in grid exceed threshold - species distribution in QGIS

I have distribution data of a set of species (plants, mosses and lichens: 13 species total) in the Netherlands. I made a grid that divides the Netherlands into 1x1 km squares. I am not interested in ...
Stevestingray's user avatar
1 vote
1 answer
548 views

Counting unique species in polygon layer and buffer

Within QGIS I'm working on a data set that contains species at 100m resolution (eg OSGB 6 fig) and 10m or finer resolution (eg OSGB 8 or 10fig). The objective is to count the number of unique species ...
ferus89's user avatar
  • 329
1 vote
2 answers
96 views

SDM: Dealing with coarse environmental data

I wish to determine the most important environmental covariates controlling a species distribution. I have a large collection of species presence data for a small survey area (e.g., 600 presence ...
user135563's user avatar
3 votes
1 answer
465 views

From areas of several species ranges (polygons) to a map (raster) expressing the count of overlapping polygons

I am not able to resolve the problem that follows. I have some separate shapefiles files, each one representing a given species range. Some layers have multiple polygons. I would prefer to solve this ...
Marco's user avatar
  • 355
1 vote
1 answer
271 views

Extracting raster values from polygon perimeters using ArcGIS Spatial Analyst?

I am currently working on a project to identify local ponds or water bodies that have high probability of species occurrence. I'm using BioClim climate data, SSURGO soil data, and a DEM layer for a ...
Evan Bare's user avatar
0 votes
2 answers
291 views

Species ranges into fishnet grids

I need to create a fishnet grid (presence and absences) form species distribution areas (polygon shapes). But I need to define that presence (value 1) is correct when more than 30% of the grid is ...
Agustina Novillo's user avatar
1 vote
1 answer
328 views

Kriging predictions for presence only data with Maxent

I was doing some geostatistical analysis (variogram+kriging) for a "presence only" type data in a species distribution modeling context. Since, we know that when estimating the (empirical) variogram, ...
Asad Ali's user avatar
  • 141
1 vote
1 answer
1k views

Designing interactive map of botanical garden in QGIS?

Using QGIS is absolutely new to me but I hope, we can make it as short and easy as possible to put my idea into practice. I hope that QGIS is the appropriate program for this purpose. I have COREL-...
eckeneckepen's user avatar
2 votes
1 answer
952 views

Is there a way to create a presence/absence matrix of polygons per cell in a grid using qGIS?

I'm working in QGIS with species distribution polygons and I want to know how many cells in a grid does the polygon overlap. I've tried creating random points within the polygon and then used vector&...
clopeza's user avatar
  • 21
1 vote
0 answers
151 views

Maxent Probabilities Values

I am working on my first experiment with Maxent. I am using two different species. When I receive the output map and look at it in QGIS the values for suitable habitat probability do not sum to 1. ...
Bill's user avatar
  • 11
2 votes
0 answers
274 views

Risk and vulnerability analysis for the spread of alien species [closed]

Based on knowledge about the potential for proliferation of alien forests species we are looking at possibilities for modelling the process. Inputs should be area for initial plants, wind, elevation, ...
ragnvald's user avatar
  • 3,191