That is the amount of distortion we have in the simple projection below (one of the more common in web maps of the world today).Ĭredit: © Penn State University, is licensed under CC BY-NC-SA 4.0 Imagine the kinds of distortion that would be needed if you sliced open a soccer ball and tried to force it to be completely flat and rectangular with no overlapping sections. Even this simplest projection produces various kinds of distortions thus, it is necessary to have multiple types of projections to avoid specific types of distortions. Projections that are more complex yield grids in which the lengths, shapes, and spacing of the grid lines vary. The simplest kind of projection, illustrated below, transforms the graticule into a rectangular grid in which all grid lines are straight, intersect at right angles, and are equally spaced. Inverse projection formulae transform plane coordinates to geographic. The mathematical equations used to project latitude and longitude coordinates to plane coordinates are called map projections.
These georeferenced plane coordinates are referred to as projected. The true geographic coordinates called unprojected coordinate in contrast to plane coordinates, like the Universal Transverse Mercator (UTM) and State Plane Coordinates (SPC) systems, that denote positions in flattened grids. For example: what path I should give for Cmake? do I need to use all options one by one? Is the path for Cmake always / usr/local/bin? and simplify the steps of installation.Latitude and longitude coordinates specify positions in a spherical grid called the graticule (that approximates the more-or-less spherical Earth). I am new to Ubuntu, please tell me a simple way to install it in layman's language. The error was that it failed to locate the Cmake.txt file. Then I issued the first command with first option giving path to cmake: /usr/local/bin. Then I created a build directory in the IMPACT folder. So what I did, I downloaded the IMPACT tarball and untarred it in a directory called Documents. DIMPACT_NO_OPENMP=1 - Turns off OpenMP support.Total wall time will be slightly increased. DIMPACT_STOPWATCH=1 - Activates the timing functions in IMPACT.Debug builds are, obviously, for debugging and will produce debugging symbols. DCMAKE_BUILD_TYPE=Debug|Release - Release builds are the default and will produce a performance optimised installation.DCMAKE_CXX_COMPILER=c++-compiler-of-choice.DCMAKE_INSTALL_PREFIX=path-to-install-destination - Sets the install directory.Some useful options, some of which are standard cmake options, are: I'm trying to follow these steps to complete installation: Requirements:ĬMake v 2.8 or higher. I am trying to install software called 'IMPACT' on my Ubuntu OS.
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