r - Calculating area of occupancy from a binary unprojected raster -


I have a series of binary wrapper layers (ASCI files) showing the presence / absence of species in Europe and Africa. The file is based on unrestricted latitude / long (WGS84) data. My objective is to calculate the field of attendance using R (I do not have access to ARGGIS).

I know that there is a function for calculating the area in the raster package, but I worry that this will not be accurate for unrestricted data. I have also seen the cellstats function in the Rekhapur package, and can use it to "yoga" the number of "cell", but I think it has only one problem. 

  jan & lt; -raster ("/filelocation/file.asc") John Class: Rosterlear Dimensions: 13800, 9600, 132480000 (Enroo, NXL, ENCEL) Resolution: 0.008333333, 0.008333333 (X, Y) range: -20, 60, -40, 75 (Xmin, xmax, ymin, ymax) coordinate ref : NA Data source: "/ file location" Name: file.asc value: -2147483648, 2147483647 (minimum, maximum) area (mass) Category: Rastlinline Dimensions: 13800, 9600, 132480000 (Enroo, Nucleus, Encel) Resolution: 0.008333333 , 0.008333333 (X, Y) Height: -20, 60, -40, 75 (Xmin, XMX, Yemen, WiMAX) Coordination Ref. : NA Name: Layer value: 6.944444e-05, 6.944444e-05, warning message: 1: .local (x, ...): This function is only for a raster * objects in a longitude / latitude coordinate 2:. RasterFromRasterFile (grdfile, band = band, objecttype, ...): The size of the values ​​does not match the number of cells (data type given) cellstats (mass, "yoga") [1] 3559779   
   
  
  
  
  
 Div class = "post-text" "Itemprop =" text "> 
 I do not know what is going on in your file (why you give warning # 2). But here's a job  
  r < Raster (nero = 13800, niacal = 9600, xmn = -20, xmx = 60, ymn = -40, ymx = 75) # raster (jane) x = area (r) x squared: rasterline dimensions: 13800, 9600, 132480000 (Enroo, NXL, ENCEL) Resolution: 0.008333333, 0.008333333 (X, Y) range: -20, 60, -40, 75 (Xmin, XMX, Yemen, WiMAX) Coordination Ref. : + Proj = longlat + datum = WGS84 Data source: c: \ temp \ R_raster_Robert \ 2015-01-26_213612_1208_85354.grd Name: Layer value: 0.2227891, 0.8605576 (minimum, maximum)  
 
 Now you have area of ​​each cell in km2, by multiplying these values ​​with raster objects with presence / absence and then using cellstats (, 'yoga') you can get total area with presence.

Comments

Post a Comment

Popular posts from this blog

python - Overriding the save method in Django ModelForm -

I'm having trouble overriding a ModelForm save method. I get this error I'm: Exception type: TypeErier Exception Value: Save () found an unexpected keyword argument 'committed' My intentions include a form 3 fields Submit several values ​​for, then create an object for each combination of those areas, and to save each object file models.py class collarsult type (models.Model): id = model. AutoField (db_column = 'icontact_result_code_type_id', primary_key = true) callResult = models.ForeignKey ( 'CallResult', db_column = 'icontact_result_code_id') campaign = models.ForeignKey ( 'campaign', db_column = 'icampaign_id') CALLTYPE = models.ForeignKey ( 'CALLTYPE', db_column = 'icall_type_id') agent = models.BooleanField (db_column = 'bagent', default = true) teamLeader = models.BooleanField (db_column = 'bTeamLeader', default = true) active = models.BooleanField (db_column = Django.form...
Read more

html - CSS autoheight, but fit content to height of div -

I have a div in which there are three children- div in the left and middle div: float: left while true: float: true because it is my layout Actually will spoil, I've used ClearFix Hack: .cf {zoom: 1; }. Cf: First,. Cf: {content: ""; Display: Table; }. Cf: After {clear: both; } It still works, but I want to be the right div an indicator. So it should fill 100% of the parent unit of height. How can I complete this? PS is the full code: & Lt; / Div & gt; & Lt; Div class = "mobile_content" & gt; & Lt; H5 & gt; {{Data.titel}} & lt; / H5> & Lt; Table & gt; & Lt; TR & gt; & Lt; Th & gt; Komponist: & lt; / Th & gt; & Lt; TD & gt; {{Data.komponist}} & lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; Th & gt; Instrument: & lt; / Th & gt; & Lt; TD & gt; {{Data.instrumente}} & lt; / TD & gt; & Lt; / TR & gt;...
Read more

qt - How to prevent QAudioInput from automatically boosting the master volume to 100%? -

I have been trying to use Qt5 multimedia to record audio with QAudioInput, however, when I see If QAudioInput is started, it increases the master volume of my sound device to 100%. How can I prevent QAudioInput from changing the master volume? My current development platform is Linux with PalsAdio (with flat audio disabled). How can I use QAudioInput : QAudioDeviceInfo device_info = QAudioDeviceInfo :: defaultInputDevice (); QAudio format format; Format.setSampleRate (44100); Format.setChannelCount (1); Format.setSampleSize (16); Format.setCodec ("Audio / PCM"); Format.setSampleType (QAudioFormat :: SignedInt); Format.setByteOrder (QAudioFormat :: LittleEndian); Std :: cout & lt; & Lt; Device_info.deviceName (). ToUtf8 (). ConstData () & lt; & Lt; Std :: endl; QAudioInput * default_device = new QAudioInput (device_info, format); QIODevice * default_io_device = default_device-> Start (); a QAudioInput.setVolume () method is not you I ...
Read more