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6

It is correct to use an equal area projection in order to compute the area of your polygon. However, in your case, you should be aware that only the vertices of a polygon are projected when you change the coordinate system. Between the vertices, straight lines are then interpolated (but if you have a huge polygons, those lines should have been curves), ...


3

You have to create a custom CRS with miles as units, like +proj=lcc +lat_1=33 +lat_2=45 +lat_0=39 +lon_0=-96 +x_0=0 +y_0=0 +datum=NAD83 +units=mi +no_defs Then save your data to that CRS and turn on-the-fly-reprojection OFF. Unfortunately, the distance tools still writes km as unit, but the USA is about 2886 miles wide, while it is 4649 km in the ...


2

WGS 84/ UTM 48N. My coordinates are in decimal degrees is a contradiction. If they are in decimal degrees, you must set the layer CRS to EPSG:4326, not any UTM system which has meters as units. From that point, use Rightclick, Save As ... to another filename and EPSG:3857 as CRS. With the project CRS set to EPSG:3857 and Oepnlayers background tiles, the ...


2

Your model fails because your input shape files have names that contain spaces. As feature class names cannot contain spaces, you need to use add the Calculate Value tool to your model to remove spaces from your inline variable "Name" and replace them with underscores. In the model below, the Name variable is precondition to the Calculate Value tool. ...


2

It is confusing and you might ask clarification from the professor. It may be that the professor wanted each requirement to be distinctly one thing. He/she could have written: The shapefile must have an assigned projection w/accompanying .prj file and that assigned projection must be an unprojected (geographic) WGS84 geographic coordinate system. ...


1

gdalwarp -geoloc allows you to use the complete 2d-array of latlon as georeference. With that, you can use any target CRS to reproject your data to a commonly used projection. See my answer to this question for an example: How to match a raster NetCDF data with a vector layer in QGIS?


1

Using the Project (Data Management) tool, should yield you results! If you need to assign a known coordinate system to a dataset with an unknown coordinate system, the Define Projection (Data Management) tool does that.


1

The easiest way to get the projection information is Rightclick -> Set CRS for Layer. This will report the USER:100000 you already know, and the parameters for the projection as well. +units=... will give you the units of the projection.


1

It works for me with a two-step-transformation: gdalwarp -overwrite -t_srs "+proj=stere +lat_0=90 +lat_ts=60 +lon_0=-100 +k=1 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs" -of GTiff D:\Download\NEU\ster-wgs84.tif D:/Download/NEU/ster-100-transformed.tif gdalwarp -overwrite -wo SAMPLE_STEPS=1000 -t_srs "+proj=stere +lat_0=90 +lat_ts=60 ...


1

Try with larger number of sample steps -wo SAMPLE_STEPS=1000 Reprojecting Natural Earth raster into natearth projection with gdalwarp causing black squares? Or with lower error threshold -et 0.01 gdalwarp leaves horizontal artifacts regridding from EASE-Grid (laea) to Polarstero (stere)


1

I don't believe I've ever tried it but you can set the Geographic transformations in the 'Environment Settings' of the Batch Project Tool (see attached screen shot). Note: You will have to figure out which exact transformation you require (depends on the geographic area you're dealing with. The '_6' for example is for a specific region. See this page for ...


1

Here's a well-known text string based on the parameters you listed. ...


1

There is only one official definition of the EPSG:31370 projection but several "dialects" to represent it (look at Spatial Reference: EPSG:31370 or epsg io: 31370) The official OGC WKT string is: PROJCS["Belge 1972 / Belgian Lambert 72",GEOGCS["Belge 1972",DATUM["Reseau_National_Belge_1972",SPHEROID["International ...


1

I would suggest using Lambert's Conformal Conic, it has its standard parallel at 50 & 20 degrees North which is ideal for the countries you list. Plus I think it looks pretty cool.


1

Just incase some had the same problem as me. The lat and long fields dont change their values when you do the correct projection. Once you are in the correct projection system in the dataframe, and you export the data using that GCS projection system, you then add the layer to the dataframe. Next, you need to go to the attributes table for that new layer. ...


1

I coded the sinusoidal intercepted projection in javascript, so it runs in web browser. You can check it here: http://www.winski.net/?page_id=12 You only need to pick your input image, sinusoidal intercepted projection from list of projections, number of gores, and click "project". It is under BSD, so feel free to do anything you want with it :)



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