, = integers. The end points of all possible translations vectors define the lattice as a periodic sequence of points in space. Unfortunately, one and the same lattice can be defined by many different sets of vector triples as illustrated right below. construct, a succession of (infinitely small) mathematical points in space. A perfect drawing…

Like the peel of an orange, it is not possible to lay the surface of the Earth flat without breaking or distorting it in some way. Map makers use projections to systematically manage these distortions. There are many different types of projection that can be used. The most common are related to different geometric shapes…

This program may be especially useful when sampling for cross validation of interpolations whose output is a raster map. When NULL values are encountered for a cell, zero value is used instead. In these cases, more acurrate results may be obtained by using the default nearest neighbor comparisons. When interpolation is done (i.e., the -bc…

Disclaimer: EBOOKEE is a search engine of ebooks on the Internet (4shared Mediafire Rapidshare) and does not upload or store any files on its server. Please contact the content providers to delete files if any and email us, we’ll remove relevant links or contents immediately. This book is ideal for those who want to learn…

in creating, manipulation, managing, analyzing, and presenting spatial information using Geographic Information Systems (GIS). Additionally, students will gain experience in applying GIS capabilities to investigate environmental and social issues. This course introduces the computer-based concepts and skills of Geographic Information Systems (GIS). It covers the GIS concepts such as map characteristics and projections, spatial data…

org.springframework.security.providers.anonymous.AnonymousProcessingFilter.doFilterHttp(AnonymousProcessingFilter.java:105) org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:235) Hello all, I finally found the problem and thought I would share in case someone may need this. My WMS layer was created using ‘singleTile=true’ and once it was removed all worked well, including the seeding function. So it seems that SingleTile=’true’ and the cacheWrite functions are not compatible with each other. The…

I am getting stuck with a task that is slightly different from the posts I found so far on this same website. Problem: I would like to automate a python script (using arcGIS 10.1 but 10.0 is fine as well) that projects a list of vector layers (some of which with different coordinate systems) to…

After adding several datasets to an ArcMap Data Frame, features in some layers do not align correctly with other layers. When adding data to ArcMap, the application reads the coordinate system (projection) information stored with the dataset. When displaying multiple datasets with different coordinate systems, ArcMap will project the data ‘on-the-fly’ to the coordinate system…

Unsure of which projection to use in your GIS work? This tutorial will help you figure out your options. For an accessible introduction to coordinate systems and map projections, please see the Coordinate Systems and Projections page in the Scholars GeoPortal user guide or UofT Geography Professor Don Boyes’ lecture materials on Earth and its…

uf->,u and vf->,v are 3-dimensional arrays (of the same size) of wind velocity vector data, where the first dimension represents time, the second dimension represents latitude, and the third dimension represents longitude (verify this with print(getfilevardims(uf,’u’))). By using the syntax (0,:,:), you are selecting the vector field for the full latitude/longitude range for the first…

There are thousands of geographical reference systems. In order to combine datasets with different geographical reference systems into a map, the datasets will have to be transformed (projected) to the chosen geographical reference system of the map. If you want to know more about geographical reference systems and map projections in general, please see the…

The Mercator projection was first invented to help mariners. They needed to be able to take a course and know the distance traveled, and draw a line on the map which showed the day’s journey. In order to do this, Mercator invented a projection which preserved length, by projecting the earth’s surface onto a cylinder,…