This page contains the list of issues addressed in arcgis 10. Sinusoidal projection gis wiki the gis encyclopedia. This pairing is among the list of recommended pairings but why. Navigate to the coordinate systems folder at the following default location. However i want to do area calculations using the grid that i created with a modissinusoidal projection and the crop census data which has a lo19 projection. When choosing a projection in which to store your database, consider the databases primary use. First, i want to get your professional advice on whether using the sinusoidal projection is the best we have for our case.
Jean cossin of dieppe was one of the first mapmakers to use the sinusoidal, appearing in a world map of 1570 the projection represents the poles as points, as they are on the sphere, but the meridians and continents are distorted. Maptiler is desktop app designed to turn large raster datasets into zoomable maps for your website. Acquire projection files in the coordinate systems. A projection is the means by which you display the coordinate system and your data on a flat surface, such as a piece of paper or a digital screen. That is the great circle on which the two points lie. I think you need a few more parameters in the proj4 string specifically the. High resolution sinusoidal interrupted projection of the earth. Meridians are geometrically projected onto the cylindrical surface, and parallels are mathematically projected. Display of pixel loss and replication in reprojecting raster data from the sinusoidal projection article pdf available in geocarto international 212. The simple geographic latlon projection is only used for the coarsest resolution grid, produced at 0. The sinusoidal map projection is shown centered on greenwich. The sitespecific land product data can be downloaded in both comma separated value. Converting modis hdfs with sinusoidal projections to.
Convert modis hdf file in sinusoidal projection into geotiff with. According to various websites, modis data providers used an integerized sinusoidal grid projection up through version 3 v3 of modis data. The result of a sinusoidal projection is shown above. Boundary meridians quite excessively bulge outwards. You can also set the data frame in arcgis double click on the data frame name, e. If you are unable to download and save the projection files from above then see our website. Reasons for using a projected coordinate system you want to make accurate measurements from your map and be sure that spatial analysis options calculate distance correctly. Automated map projection selection for gis automated map projection selection for gis. The sinusoidal projection is a coordinate transform often used to map geographical coordinates on to a flat surface in order to generate a map. The equalarea sinusoidal map projection that is used internally in our software calculates the correct area size of 219. The modis land products are produced at 4 resolutions 250m, 500m, 1km, and 0. Second, if so, is it better to use sphere instead of wgs84 given that arcinfo ws does not support a spheroid.
Smaller regions using the interrupted form exhibit less distortion than the uninterrupted sinusoidal projection of the world. This video tutorial demonstrates how to reproject modis mod10a2 tile using epsg projection wgs 84 utm zone 43n. Overwrites the coordinate system information map projection and datum stored with a dataset. At one time this grid was called the sansonflamsteed projection in honor of nicholas sanson, the french cartographer, and flamsteed, the. I assume that both shapefiles need to be in the same coordinate system for the calculations to be accurate. I have been work in convert the modis tiles grid from sinusoidal projection to lat long projection using python ogr2ogr. This tool is intended for datasets that have an unknown or incorrect coordinate system defined. Ornl daac 37, search and order, data handling, subsetting and filtering, geolocation, reprojection, and mapping, data visualization and analysis. It doenst works well, the shapefile reprojected presents some lines that was not present in the original shape and it produces many mismatching.
Download the list of supported geographic and vertical coordinate systems. The sinusoidal projection is a pseudocylindrical equalarea map projection, sometimes called the sansonflamsteed or the mercator equalarea projection. Find downloads for patches, service packs, code samples and more for a specific product. These two projections nearly identical, so you might spot the differences in direct comparision only. Coordinate systems, projections, and transformations. Like conic projections, cylindrical projections can also have tangent or secant cases.
Jason davies maps interrupted sinusoidal projection. Displaying the world using the sinusoidal projection left and the robinson projection right. Using a sinusoidal map projection with a center longitude set to the craters centralpoint, the diameter of the impact crater is measured along this central meridian which is truescale and does not show any distortion. The mercator projection is one of the most common cylindrical projections, and the equator is usually its line of tangency. R script to automatically download, mosaick and resample modis blocks to some local projection system. Due to the conformality of the mercator map projection, the area is distorted in the x and y directions and has a value of 245. Pseudocylindric projections are variants on cylindrics in which meridians are curved. Starting with version 4, data providers began using a sinusoidal grid projection.
I have searched and searched online to find ways of calculating the conversion between the datumless sinusoidal projection and something with a datum such as wgs84 latlong. Understanding map projections arcgis technical support. Learn more about the sinusoidal projection learn more about the twopoint equidistant projection. The gdalogr gml srs support does not include support for sinusoidal projection so the gmljp2 box lacks all projection parameters. In the sinusoidal equal area projection all parallels and the central meridian are standard lines. For example, in the sinusoidal projection, the equator and all parallels are their true lengths.
Try rerunning the translation with the co gmljp2no option and see if that makes any difference. In other equidistant projections, the equator and all meridians are. The central meridian is straight, and the others are curves that derive from a true division of each parallel. Using modis land cover data in arcgis center for earth. Select the desired projection from the dropdown or search for it in the search bar. A pseudocylindrical projection where all parallels and the central meridian are straight. Where to find and or create the projection files for. Also known as sansonflamsteedas a world map, this projection maintains equal area despite conformal distortion. The sinusoidal projection is a pseudocylindrical equalarea projection displaying all parallels and the central meridian at true scale. The meridians are curves based on sine functions with. Acquire projection files in the coordinate systems folder in arcgis for desktop 10.
How to fix a shapefile reprojected from sinusoidal. The sinusoidal projection is an equalarea world map projection that has straight, horizontal parallels spaced equally at their true distances. To achieve this accuracy with a sinusoidal projectionat least at the boundaries of all land massesrequires each gore to extend no more than about 6 degrees from its central meridian. Crasters parabolic eckertgreifendorff putnins p6 quartic authalic.
Display of pixel loss and replication in reprojecting. Modis reproject tool mrt overview modis where to download it. Projecting vectors in lo19 projection to modis sinusoidal. Io database and has support for any coordinate system. The shortest route between two points on a curved surface such as the earth is along the spherical equivalent of a straight line on a flat surface. This projection compresses shapes in higher latitudes, but shapes are good in the central section. Geographic coordinates and the sinusoidal projection both showed very high accuracy rates 100. The crater is reprojected to the map projection of the current data frame and stored as vector geometry with attributes.
Convert back to latlon from xy integrated software for. Converting modis hdfs with sinusoidal projections to arcgis raster. It is typically stated that this projection is area. One could reproject the raster to a coordinate system better suited for the state of maine however, in doing so, we risk. This is because the modis data were provided to us in a sinusoidal projection which distorts shape in our area of interest. Define projectiondata management toolbox arcgis pro. The sinusoidal projection is an equalarea world map projection that has. The sinusoidal projection is also known as the sansonflamsteed and mercatorsanson projection after the cartographers who used it. The slightly higher position of the last bin diameter range of 600700 m is. I am having difficulty reprojecting the data tiles i have downloaded from the nasa modis data pool from the modis sinusoidal projection to say wgs84 geographic coordinates. It uses a variety of data formats shapefile1, shapefile2, dxf and pseudo vpf and different coordinate systems utm30, utm33, sinusoidal, and geographic and projects these together onthefly into other coordinate systems for display. Alternative formats reduce the distortion along outer meridians by interrupting the continuity of the. Gallery of seventyone map projections currently supported in arcgis 10.
Any of the equalarea projections with a pole line mentioned above. The crux of this problem is understanding the modis sinusoidal projection and representing it properly in arcgis. Modis tiling system world map based on the gpolygon field in the xml files attached to the original tiles. Media in category maps with sinusoidal projection the following 11 files are in this category, out of 11 total. Databases created under contract or to be used by a government organization are often in a projection determined by the governing body, such as state plane in the united states or great britain national grid in the united kingdom. Download the data then uncompress the files contents to your ndvi folder. All geographic datasets have a coordinate system that is used throughout arcgis to display, measure, and transform geographic data. Seiler mapping support scroll down and on the right underneath the general support column look for below the gpscorrect and gps analyst links and locate and click on. Alternative formats reduce the distortion along outer meridians by interrupting the continuity of the projection over the oceans and by centering the continents around their own central meridians, or vice versa.
The instructions provided describe where to find the projection files located in the coordinate systems folder in arcgis for desktop 10. The subsections below describe the sinusoidal projection properties. We obtained the gshhs shoreline by downloading the gshhs 2. The sinusoidal projection maintains equal area despite conformal distortion as a world map.
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