Shape file of USA land cover data
The error message already advises on what is required: "you use rgdal version: 0.7-19. You need version 0.7-22 or higher". Is that not clear somehow? It's important to read the messages and work on understanding them. Please upgrade to latest rgdal and raster, it only creates extra work trying to chase issues with outdated versions. If you have trouble upgrading then that's another topic, for another list. The "R Installation and Administration" manual is the first port of call for maintaining your R installation, but how to do it exactly will depend on your set up, operating system, whether your R is current, and other things that we do not know. Cheers, Mike.
On Thu, Dec 6, 2012 at 3:09 PM, Milan Sharma <milansharma2012 at yahoo.com> wrote:
Hi Erin, I got the following error.. Can you advise me of the solution?
setwd("C://Users//milan//Desktop")
r <- raster("nlcd2006_landcover_4-20-11_se5.img")
Error in .requireRgdal(FALSE) : you use rgdal version: 0.7-19 You need version 0.7-22 or higher
________________________________
From: "Hodgess, Erin" <HodgessE at uhd.edu>
To: Michael Sumner <mdsumner at gmail.com>; Milan Sharma
<milansharma2012 at yahoo.com>
Cc: "r-sig-geo at r-project.org" <r-sig-geo at r-project.org>
Sent: Wednesday, December 5, 2012 9:45 PM
Subject: RE: [R-sig-Geo] Shape file of USA land cover data
Hi
I got the same data set that Milan did and used the raster:
r <- raster("c://goodc//nlcd2006_landcover_4-20-11_se5.img")
and it worked. When I used gdal, it said that it was too big.
Thanks,
Erin
PS the plot looks really nice too.
________________________________________
From: r-sig-geo-bounces at r-project.org [r-sig-geo-bounces at r-project.org] on
behalf of Michael Sumner [mdsumner at gmail.com]
Sent: Wednesday, December 05, 2012 8:34 PM
To: Milan Sharma
Cc: r-sig-geo at r-project.org
Subject: Re: [R-sig-Geo] Shape file of USA land cover data
It's not a shapefile, and it's not a vector format. It's a gridded
(raster) format. Specifically it's an Erdas Imaging (.img) format:
http://www.gdal.org/frmt_hfa.html
I tried the Hawaii one which is much smaller (2.4Mb) and so more
reasonable to share.
http://gisdata.usgs.gov/TDDS/DownloadFile.php?TYPE=nlcdhi&FNAME=HI_landcover_wimperv_9-30-08_se5.zip
You seem to have found metadata files, but I haven't found what you
presented to us.
I get this:
list.files()
[1] "hi_landcover_wimperv_9-30-08_se5.img"
[2] "hi_landcover_wimperv_9-30-08_se5.rrd"
[3] "landcov_meta_web_final"
library(raster)
r <- raster("hi_landcover_wimperv_9-30-08_se5.img")
r
class : RasterLayer
dimensions : 12618, 19439, 245281302 (nrow, ncol, ncell)
resolution : 30, 30 (x, y)
extent : -345945, 237225, 1753875, 2132415 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=aea +lat_1=8.000000000000002 +lat_2=18 +lat_0=3
+lon_0=-157 +x_0=0 +y_0=0 +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +units=m
+no_defs
data source :
C:\Users\Michaels\Downloads\HI_landcover_wimperv_9-30-08_se5\hi_landcover_wimperv_9-30-08_se5.img
names : hi_landcover_wimperv_9.30.08_se5
values : 0, 95 (min, max)
Raster Attribute Table
fields : ID COUNT Red Green Blue Land.Cover.Class Opacity
min : 0 0 0.00 0.00 0.00 0
max : 255 221606161 0.98 0.98 0.98 Woody Wetlands 1
You'll have to work through the documentation for rasters to
understand how to work with these data. The raster package requires
rgdal to load this format, and you could do that more directly with
require(rgdal)
r <- readGDAL("hi_landcover_wimperv_9-30-08_se5.img")
though arguably raster is probably a better place to start.
Cheers, Mike.
On Thu, Dec 6, 2012 at 1:10 PM, Milan Sharma <milansharma2012 at yahoo.com>
wrote:
Hi List,
I wanted to download national land cover data of USA, 2006 which I could
convert to shape file and do analysis. The website is
http://www.mrlc.gov/nlcd01_data.php.
I got the following 6 files in it:
1. appendix1_nlcd2006_scene_list_by_path_row_txt
2. appendix1_nlcd2006_scene_list_by_path_zone_txt
3. metadata_nlcd2006_lc_4-20-11-txt
4. metadata_nlcd2006_lc_4-20-11-se5.ige
5. metadata_nlcd2006_lc_4-20-11-se5.img
6.metadata_nlcd2006_lc_4-20-11-se5.rrd
I didn't see any shape file in here, or will I get the shape file from any
one the above file formats?
(Has anybody in the list downloaded such data?) (or can anybody instruct
me of how to get it done?
Thanks so much for your help,
Milan
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