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added proj string as text

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edited Dec 13, 2019 at 22:05

mkennedy

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In QGIS 3.4 I'm trying to add a custom projection that was used for topographic maps of Suriname in the 1950s. I have the parameters from an article about historical CRS used in the country. Using the proj documentation I defined the custom CRS. I even tested it and the returned coordinates confirm that the projection does what I want. However, when I click OK to add the custom CRS, I get the popup: "The proj4 definition of 'Roussilhe Suriname' is not valid."

Here is the proj string:

 +proj=rouss +lat_0=4.11667 +lon_0=-55.68333 +k_0=0.9996 +x_0=300000 +y_0=775000 +ellps=bessel +units=km +no_defs

How can I test it, but then get the message that the definition is invalid? In any case, I now very little about proj4 and can't find the error. Below is a snip of the article containing the parameters.

In QGIS 3.4 I'm trying to add a custom projection that was used for topographic maps of Suriname in the 1950s. I have the parameters from an article about historical CRS used in the country. Using the proj documentation I defined the custom CRS. I even tested it and the returned coordinates confirm that the projection does what I want. However, when I click OK to add the custom CRS, I get the popup: "The proj4 definition of 'Roussilhe Suriname' is not valid."

How can I test it, but then get the message that the definition is invalid? In any case, I now very little about proj4 and can't find the error. Below is a snip of the article containing the parameters.

In QGIS 3.4 I'm trying to add a custom projection that was used for topographic maps of Suriname in the 1950s. I have the parameters from an article about historical CRS used in the country. Using the proj documentation I defined the custom CRS. I even tested it and the returned coordinates confirm that the projection does what I want. However, when I click OK to add the custom CRS, I get the popup: "The proj4 definition of 'Roussilhe Suriname' is not valid."

Here is the proj string:

 +proj=rouss +lat_0=4.11667 +lon_0=-55.68333 +k_0=0.9996 +x_0=300000 +y_0=775000 +ellps=bessel +units=km +no_defs

How can I test it, but then get the message that the definition is invalid? In any case, I now very little about proj4 and can't find the error. Below is a snip of the article containing the parameters.

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asked Dec 13, 2019 at 12:38

Gin

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QGIS proj4 definition is not valid

In QGIS 3.4 I'm trying to add a custom projection that was used for topographic maps of Suriname in the 1950s. I have the parameters from an article about historical CRS used in the country. Using the proj documentation I defined the custom CRS. I even tested it and the returned coordinates confirm that the projection does what I want. However, when I click OK to add the custom CRS, I get the popup: "The proj4 definition of 'Roussilhe Suriname' is not valid."

How can I test it, but then get the message that the definition is invalid? In any case, I now very little about proj4 and can't find the error. Below is a snip of the article containing the parameters.

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QGIS proj4 definition is not valid