Questions tagged [maxent]

Software and algorithm for ecological niche modeling.

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17 views

Maxent “NO DATA_value” Error

I am trying to run Maxent and I have processed all layers and converted them into .asc files (all layers have the same resolution and extent), there are no 'No Data' areas within the projection extent ...
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1answer
39 views

Getting startAsciiWriting (x, filename, …) error in R?

I am new to R. I am trying to transform elevation data in R for input into MaxEnt. Returned: Error in .startAsciiwriting (x,filename ...): x has unequal horizontal and vertical resolutions. Such ...
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91 views

Maxent error: Error projecting, two layers have different geographic dimensions

When I run climate data (signed 16 bit) and land use data (unsigned 8 bit) on Maxent, I got an error message: Error projecting: java.io.IOException: Files bio6 and alt in directory D:\WorldClim\...
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1answer
64 views

Extracting residuals of maxent model in R?

I used "dismo" package in R, and ran a build a maxent model. Now I want to extract the residuals from the model in order to run a Moran I test later. But I got an error. The code was like: xm<-...
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1answer
23 views

How to create multi-scale variables from landcover data

I have calculated raster files with values of 0 and 1 for each landcover attribute I am interested in. I would like to make multiple raster files containing different cell sizes. e.g 100m2, 500m2, ...
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2answers
572 views

Converting .tif to .asc for MaxEnt

I want to convert some .tifs to .asc to use in MaxEnt. I have tried using both ArcGIS 10.5.1 (the "Raster to ASCII" tool) and QGIS 2.14.3 (Raster > Translate tool). Both give .asc files, but when I ...
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0answers
69 views

Points and bioclim layers plot correctly in R, but not in Maxent.jar

I am trying to use Maxent.jar. This program uses a CSV file of points and ascii bioclim layers (basically, a map of the Americas with climate data) and overlays them on top of one another. I find ...
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1answer
77 views

Can I consider as continuous data vegetation layers on Maxent?

I would like to know if we can consider as continuous data vegetal layers when disposed on seperate different .asc files (e.g.: Barren.asc; Water.asc; Evergreen Broadleaf Trees.asc; etc.)? The data on ...
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1answer
193 views

Running MaxEnt modelling in “dismo” using “loop” and storing the results in seperate objects and folders [closed]

I am doing a MaxEnt modelling using "dismo". I am using a loop to give multiple runs. I wanted to save results from individual runs in separate objects and at the same time the results from individual ...
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1answer
766 views

java.lang.NumberFormatException: For input string: “-?”

I'm getting an error in Maxent which arises from one of the output files created by Maxent, in this case the _ASCII_novel.asc at row 159 column 444. However, the data in this position appears to be OK....
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1answer
133 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 ...
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1answer
370 views

How can I calculate averaged response curves for Maxent models fitted using maxnet package in R?

Could someone please point me towards an efficient approach? plot and response.plot (maxnet package) can produce response curves for individual models, but feeding a list of model replicates, as ...
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1answer
560 views

dismo - Plotting individual predictor responses

I have a MaxEnt model implemented in dismo package. The package has the convenient function response to plot predictors' responses as the ones provided by the model html output, in R plotting style. ...
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59 views

'Spline' tool in ArcGIS Pro keeps dropping collinear points

I am trying to convert the WorldClim dataset from their original resolution of 30 arc-seconds (WGS1984) to 25m cells (OSGB British National Grid) for use in Maxent modelling. I clipped the ...
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2answers
366 views

Translating tif rasters to asc taking a long time

I need to use the 19 WorldClim variables in MAXENT, so I have to take the .tif files to .asc files using the translate tool. It's taking forever for me (2% after 2 hours). I've given up. I know its ...
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1answer
668 views

Maxent error 'java.lang.NumberFormatException: For input string:“Z^,,,”'

I converted a shp file into asc file in QGIS. Then I tried running the Maxent with that enviromental layer and came across that error message: java.lang.NumberFormatException: For input string:“Z^,,,”...
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82 views

rasterizing for maxent? [closed]

Im working with MAXENT and im having trouble using some shapefile files with critical variables. I rasterized the shapefiles into rasters selecting one attribute from the attribute table, but before ...
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2answers
490 views

MAXENT and shapefiles?

I'm trying to make a Potential Distribution map for an animal species that, we think, should be dependent on edaphic variables. The problem is the only maps I could find with edaphic information are ...
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1answer
159 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, ...
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43 views

Maxent and GEBCO incompatibility

I downloaded GEBCO bathymetry data and trimmed all my environmental data with ArcGIS according to my GEBCO mask, but Maxent can't run when I insert the GEBCO data. When I delete it and only run it ...
2
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1answer
49 views

r.maxent.lambdas command not recognized in GRASS after installing extension

Running Grass 7.0.5 on a Windows 10 machine, I installed the 'r.maxent.lambdas' addon with the g.extension command: g.extension extension=r.maxent.lambdas Downloading precompiled GRASS Addons ... ...
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407 views

Maxent Error reading output row and column

I need to predict geographical distribution of an insect using maxent. I have converted the bioclim data variable to ascii format to use with the collection records. After loading the files and when ...
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1answer
60 views

Making Raster of Northings (for use in Maxent) in ArcMap?

I'm working on building Maxent species distribution models for rockfish along the Northern California Coast. To do this I need rasters of predictor variables, and I want to capture latitudinal ...
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1answer
219 views

Fixing raster.asc to work with Maxent?

How to fix the raster.asc to work with Maxent? Running Maxent with raster from WorldClim and others as Altitude, LandCover, etc. I have problems because shows up one error (have different geographic ...
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2answers
304 views

WorldClim Variables to Maxent?

I downloaded the Worldclim variables, they are in extension .adf. I want to extract by mask using ArcGis, but when I do the process the new layer is not with the same information than orginal. In fact,...
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2answers
83 views

Creating contiguous dispersal surface between two climate-change scenarios in ArcGIS for Desktop?

I'm modelling the distributions of Australian parrots in response to climate change. I have two climate scenarios (present and future), and have used Maximum Entropy modelling to generate maps of ...
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1answer
236 views

Calculating raster area by converting to points to account for latitude changes?

I am looking at a large geographic area (e.g., continental Africa). I generated a raster of modeled habitat (using MaxEnt) defined in WGS 1984 depicting the hypothetical distribution of an organism at ...
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84 views

Convert a SHP file set to a categorised ASC raster with Qgis?

I have a shapefile with regolith (soil) data that I would like to use as a categorised raster (say 007_1ASC) in Maxent. The regolith data is in the following files: 007_1.cpg 007_1.dbf 007_1.prj ...
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154 views

How to create a distance from road raster in QGIS? (Maxent Bias)

I am trying to create a raster to show the distance from a road for an area in Australia. I have the Open Street Map data downloaded and converted to a *.SHP file. Is there a way to produce a raster ...
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1answer
1k views

Differences in MaxEnt between 'Biomod2' and 'Dismo' package

I am trying to run an ensemble species distribution, however the the results I am getting for MAXENT.Phillips model are not reasonable projections compared to the Random Forest and Boosted Regression ...
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244 views

Preparing CliMond data for Maxent

I had been working with BioClim data and that was working in Maxent. I could clip files and realign them etc. Now I have some data from CliMond which is in two formats: Either as text files ...
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2answers
734 views

Changing pixel size in 'asc' file using Qgis?

I have soil data and BioClim data from Australia soil data: rows 2200 columns 1400 pixel size 0.0025, -0.0025 255 BioClim data: rows 660 columsn 420 pixel size 0.00833333, -0.00833333 I am ...
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0answers
128 views

Predicting map using maxent software [closed]

I am in the process of developing predicting map in MAXENT. I have current data of distribution of my trees species in tropical forest. I need to use Maxent software and Arcgis 10.3 to find the ...
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95 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. ...
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2answers
316 views

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

I have insect traps data with several hundreds insects caught every day. In this paper, authors say "Running the model using the number of mosquitoes per trap-night resulted in clustering of high ...
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1answer
502 views

Using Minimum Convex Polygon in Maxent

I am currently using Maxent to model species distribution over time using climate change data and species occurrence. I am working with three environmental variables which are all set to the same ...
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1answer
168 views

Maxent species distribution

I am in the process of developing distribution map in MAXENT. My species habitat is subset of another mammal habitat. I have distribution layer digitised for mammal species, rasterised and converted ...
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2answers
2k views

Creating spatial Reference to ASCII file

I have produced ASCII files in MaxEnt. These files are able to be loaded into Arcmap10.1 and display as an image, but I cannot interpret them or create them into a polygon for further analysis. I have ...
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0answers
219 views

Maxent output clips to minimum extent of all input variables

I am experiencing an issue with the spatial extent of my output ASC files. I am using the UK Land Cover Map (LCM) 2007 at 25 metres resolution as a categorical variable in my Maxent modelling, ...
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1answer
1k views

Using raster calculator in ModelBuilder to batch reclassify hundreds of rasters?

I'm attempting to use iterate by raster to feed all the files through a simple map algebra expression (I'm looking at data that indicates probability of salamander habitat) so I want to reclassify the ...
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115 views

Sources for meterological data with high resolution

I was running Maxent on an endemic species of andaman and nicobar.But the climate data I have from worlclim.org ( tile number 29 ) is not of high resolution and thus I can't see the distribution ...
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546 views

Maxent out of bound error?

I selected my climate data from wordclim ( tile 29 ) and then used QGis to convert the data to .asc format . My occurrence data is in degree decimal.But when I run Maxent on any layer it says that the ...
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1answer
2k views

Input data to Maxent niche modelling tool?

I have following question regarding the input format of files to Maxent. From here I downloaded the environmental layers but they are in tiff format and I guess the tool needs in asc format where ...
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1answer
349 views

List index out of bounds [-1] when making bioclimatic variables in DIVA GIS

I am working with climate data and I would like to make 19 bioclimatic variables which I can use for ecolgical niche modeling in Maxent. I am following this tutorial http://www.ccafs-climate.org/...