Hi everybody, I have a data base (baseat_part.txt) on a plant species with records attached to the centers of grid cells. Because I don't have softwares as arcgis, I'd like to learn spatial analyses with R. I have wgs84 coordinates and 3 status for the species population (casual=50 plants; unknown=500; established=1500).I just tried to see data with a simple plot (scriptat_part.R) but I must represent the density of population. I found kde2d but I don't know if kernel suits and what it means. The grid resolution can vary (not in this partial base but in others; '1' means 3km and '2' means 6 km so I must assign them to the first ones). I just heard about krigeage and nearest neighbors but I don't know how to use them to calculate the number of plants by grid cell. The objective is to have 'net cbf' format because I will transfer the distribution map to emission map (with estimated quantities of pollen production). Thanks a lot for your help. Alice ------------------------------------------------ Alice SCHAFFHAUSER Post-doctoral fellow ATOPICA project Plant and fire ecology (FIRE PARADOX) Paleoecology of peatlands and pedogeomorphology ------------------------------------------------ aliceschaffhauser at yahoo.fr alice.schaffhauser at lsce.ipsl.fr ------------------------------------------------ Work address: ? LSCE-CEA Orme des Merisiers, ? 91191 Gif-sur-Yvette cedex France Tel : 33 (0)1 69 08 77 23 Fax : 33 (0)1 69 08 77 16 -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://stat.ethz.ch/pipermail/r-sig-geo/attachments/20120223/993efa72/attachment.html> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: scriptat_part.txt URL: <https://stat.ethz.ch/pipermail/r-sig-geo/attachments/20120223/993efa72/attachment.txt> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: baseat_part.txt URL: <https://stat.ethz.ch/pipermail/r-sig-geo/attachments/20120223/993efa72/attachment-0001.txt>
Density of population
1 message · alice schaffhauser