Showing posts with label online. Show all posts
Showing posts with label online. Show all posts
Friday, May 24, 2013
Wednesday, January 16, 2013
Online Spatial Data Sources - FEDERAL GOVERNMENT RESOURCES
THE UNITED STATES GEOLOGICAL SURVEY: (http://www.usgs.gov/). Home of the National Mapping Division, host for the Federal Geographic Data Committee (http://fgdc.er.usgs.gov/), the National Spatial Data Infrastructure, and headquarters for the data archive at the EROS Data Center (http://edcftp.cr.usgs.gov/).
THE UNITED STATES CENSUS BUREAU, Department of Commerce: Home of the TIGER data for computer mapping. (http://www.census.gov/)
TERRASERVER: An amalgam of government and private-sector companies, this site is part of the Microsoft network, in collaboration with the USGS, Compaq, Storage Works and Spin-2. The site allows users to download aerial photos and satellite images, searchable by name or location in a variety of scales. Claiming to be the largest online database, it contains over 3 TeraBytes of digital information. Very cool! (http://www.terraserver.microsoft.com/)
NATIONAL GEOPHYSICAL DATA CENTER: Location for all sorts of geologial and earth resources information and data. (http://www.ngdc.noaa.gov/ngdc.html)
NATIONAL OCEAN SERVICE: Center of information for mapping and charting of ports and oceans etc. (http://www.nos.noaa.gov/)
NATIONAL IMAGERY AND MAPPING AGENCY. The Agency's site provides ready access to the world's imagery, imagery intelligence and geospatial information. (http://164.214.2.59/)
DEFENSE MAPPING AGENCY TERRAIN MAPPING PROJECT OFFICE: Data collections and information on terrain mapping. (http://164.214.2.53:8001/)
NASA: Source of much existing data, and includes details of planned future systems. Many links
to follow, including a master data base to facilitate searching. (http://www.nasa.gov/)
Friday, October 26, 2012
GIS Training with QGIS - Exercise 1: Vector layers and Symbology
Exercise 1: Vector layers and Symbology
1. Install QGIS
a) Windows users should download the OSGeo online installer (requires an Internet connection for the
installation) from http://download.osgeo.org/osgeo4w/osgeo4w-setup.exe. Run the installer, and
choose “Advanced” setup. From the software list select to install qgis-unstable. Verify that GRASS
is selected for installation, and choose all the gdal16 software libraries.
b) Ubuntu Linux users can find ready-made packages from the UbuntuGIS software repository:
Details for adding this repo here: http://trac.osgeo.org/ubuntugis/wiki/UbuntuGISRepository
c) MacOS users should install packages and required frameworks from:
http://www.kyngchaos.com/software/qgis
d) Open a new folder Geodata and copy all the practice data layers from the CD into this folder.
e) Make a subfolder “Exercises” under Geodata and save all work there.
2. Start QGIS
a) Re-arrange toolbars to find all buttons easily
b) Disable all plugins except GPS, Delimited Text, GRASS, Quick Print.
c) Under Settings->Options be sure that the CRS is set to “Prompt for CRS”.
3. Load data
a) Load the background tiff file HYP_HR_SR_W.tif from the naturalearthdata.com directory
under Geodata\raster.
b) Load all shapefiles from the naturalearthdata.com directory under Geodata\vector.
c) In the Project Properties, set the projection to WGS84 (EPSG:4326).
d) Choose “Unique Value” for the classification of the layer “states_provinces”. Use the ISO
column to give each country a different outline color for its provinces. Set all the fill colors to
“None”.
e) Color the rivers and lakes layers blue.
f) Add labels to the populated_places layer. Use the Name_Town column as labels, and place the
labels below the points. Use scale dependent rendering to label the layers only when zoomed in to a
scale of 1:3,000,000 or closer.
g) Choose Graduated Symbol for the populated_places layer to display the towns with different
size symbols based on the POP_MAXI column. Enter a value of 4 in Number of classifications and
click Classify. Then change the symbol sizes such that larger populations are displayed by bigger
symbols.
h) Display the countries layer with 70% transparency, setting a separate color for each country, and
thick dark outline.
i) Zoom to Bosnia-Herzegovina and save a bookmark. Zoom to Serbia and save another bookmark.
j) Save the QGIS project as Geodata\Exercises\Balkans.qgs
4. Check the project
a) Close QGIS and reopen the project (File->Open Recent Projects).
b) Verify that all symbology has been saved and that the bookmarks work.
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