In the sinusoidal equal area projection all parallels and the central meridian are standard lines. A pseudocylindrical projection where all parallels and the central meridian are straight. The crater is reprojected to the map projection of the current data frame and stored as vector geometry with attributes. You can also set the data frame in arcgis double click on the data frame name, e. One could reproject the raster to a coordinate system better suited for the state of maine however, in doing so, we risk. Where to find and or create the projection files for. This tool is intended for datasets that have an unknown or incorrect coordinate system defined. Learn more about the sinusoidal projection learn more about the twopoint equidistant projection. 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. I think you need a few more parameters in the proj4 string specifically the. The meridians are curves based on sine functions with. 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. First, i want to get your professional advice on whether using the sinusoidal projection is the best we have for our case.
Define projectiondata management toolbox arcgis pro. Select the desired projection from the dropdown or search for it in the search bar. If you are unable to download and save the projection files from above then see our website. Geographic coordinates and the sinusoidal projection both showed very high accuracy rates 100. Gallery of seventyone map projections currently supported in arcgis 10. I assume that both shapefiles need to be in the same coordinate system for the calculations to be accurate. 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. 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. 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. Pseudocylindric projections are variants on cylindrics in which meridians are curved. High resolution sinusoidal interrupted projection of the earth.
This pairing is among the list of recommended pairings but why. 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. That is the great circle on which the two points lie. R script to automatically download, mosaick and resample modis blocks to some local projection system. The sinusoidal projection maintains equal area despite conformal distortion as a world map. The sinusoidal map projection is shown centered on greenwich.
The sitespecific land product data can be downloaded in both comma separated value. 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. 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 modis land products are produced at 4 resolutions 250m, 500m, 1km, and 0. Try rerunning the translation with the co gmljp2no option and see if that makes any difference. Coordinate systems, projections, and transformations. When choosing a projection in which to store your database, consider the databases primary use. Alternative formats reduce the distortion along outer meridians by interrupting the continuity of the. These two projections nearly identical, so you might spot the differences in direct comparision only. I have been work in convert the modis tiles grid from sinusoidal projection to lat long projection using python ogr2ogr. Also known as sansonflamsteedas a world map, this projection maintains equal area despite conformal distortion. This projection compresses shapes in higher latitudes, but shapes are good in the central section. The equalarea sinusoidal map projection that is used internally in our software calculates the correct area size of 219.
Overwrites the coordinate system information map projection and datum stored with a dataset. 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. Like conic projections, cylindrical projections can also have tangent or secant cases. Acquire projection files in the coordinate systems folder in arcgis for desktop 10. 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. This is because the modis data were provided to us in a sinusoidal projection which distorts shape in our area of interest.
The example shown above is the result of an albers conic equal area, which. Second, if so, is it better to use sphere instead of wgs84 given that arcinfo ws does not support a spheroid. It doenst works well, the shapefile reprojected presents some lines that was not present in the original shape and it produces many mismatching. The slightly higher position of the last bin diameter range of 600700 m is. How to fix a shapefile reprojected from sinusoidal. Acquire projection files in the coordinate systems. For example, in the sinusoidal projection, the equator and all parallels are their true lengths. Io database and has support for any coordinate system. We obtained the gshhs shoreline by downloading the gshhs 2. The sinusoidal projection is a pseudocylindrical equalarea projection displaying all parallels and the central meridian at true scale. Ornl daac 37, search and order, data handling, subsetting and filtering, geolocation, reprojection, and mapping, data visualization and analysis. All geographic datasets have a coordinate system that is used throughout arcgis to display, measure, and transform geographic data.
Sinusoidal projection definition is an equalarea map projection capable of showing the entire surface of the earth with all parallels as straight lines evenly spaced, the central meridian as one half the length of the equator, and all other meridians as curved lines. 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. 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. 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. Any of the equalarea projections with a pole line mentioned above. The result of a sinusoidal projection is shown above.
Boundary meridians quite excessively bulge outwards. Navigate to the coordinate systems folder at the following default location. Display of pixel loss and replication in reprojecting raster data from the sinusoidal projection article pdf available in geocarto international 212. The central meridian is straight, and the others are curves that derive from a true division of each parallel. Conic projections yield straight meridians that converge toward a single point at the poles, parallels that form concentric arcs. Find downloads for patches, service packs, code samples and more for a specific product. 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. Convert modis hdf file in sinusoidal projection into geotiff with. Smaller regions using the interrupted form exhibit less distortion than the uninterrupted sinusoidal projection of the world. The sinusoidal projection is an equalarea world map projection that has. Meridians are geometrically projected onto the cylindrical surface, and parallels are mathematically projected. Modis tiling system world map based on the gpolygon field in the xml files attached to the original tiles.
The azimuthal equidistant projection preserves both distance and direction from the central point. The mercator projection is one of the most common cylindrical projections, and the equator is usually its line of tangency. Download the data then uncompress the files contents to your ndvi folder. Using modis land cover data in arcgis center for earth.
Media in category maps with sinusoidal projection the following 11 files are in this category, out of 11 total. The gdalogr gml srs support does not include support for sinusoidal projection so the gmljp2 box lacks all projection parameters. Projecting vectors in lo19 projection to modis sinusoidal. Converting modis hdfs with sinusoidal projections to. According to various websites, modis data providers used an integerized sinusoidal grid projection up through version 3 v3 of modis data. At one time this grid was called the sansonflamsteed projection in honor of nicholas sanson, the french cartographer, and flamsteed, the. The simple geographic latlon projection is only used for the coarsest resolution grid, produced at 0. The instructions provided describe where to find the projection files located in the coordinate systems folder in arcgis for desktop 10. Modis reproject tool mrt overview modis where to download it.
This page contains the list of issues addressed in arcgis 10. 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. Automated map projection selection for gis automated map projection selection for gis. The results strongly suggest that the sinusoidal projection is very accurate and efficient for building global image databases. The sinusoidal projection is a pseudocylindrical equalarea map projection, sometimes called the sansonflamsteed or the mercator equalarea projection. Crasters parabolic eckertgreifendorff putnins p6 quartic authalic. It is typically stated that this projection is area. Sinusoidal projection gis wiki the gis encyclopedia. Maptiler is desktop app designed to turn large raster datasets into zoomable maps for your website. Download the list of supported geographic and vertical coordinate systems.
Convert back to latlon from xy integrated software for. Display of pixel loss and replication in reprojecting. Starting with version 4, data providers began using a sinusoidal grid projection. Once you have downloaded the mcd12q1 data for the modis tiles covering your study area you can open. The sinusoidal projection is an equalarea world map projection that has straight, horizontal parallels spaced equally at their true distances. Jason davies maps interrupted sinusoidal projection. Displaying the world using the sinusoidal projection left and the robinson projection right. In other equidistant projections, the equator and all meridians are. Converting modis hdfs with sinusoidal projections to arcgis raster. The sinusoidal projection is also known as the sansonflamsteed and mercatorsanson projection after the cartographers who used it. This video tutorial demonstrates how to reproject modis mod10a2 tile using epsg projection wgs 84 utm zone 43n. Understanding map projections arcgis technical support. The crux of this problem is understanding the modis sinusoidal projection and representing it properly in arcgis.
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