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--- ansvrdevelopernotes [2018/05/22 19:06]
andy created
+++ ansvrdevelopernotes [2018/05/22 23:55] (current)
andy
@@ Line 1: / Line 1: @@
 ====== ansvr Developer Notes ======
-''ansvr'' is a very thin wrapper around the astrometry.net plate solve command, ''solve-field''. If your client program is on the same machine where astrometry.net/ansvr is installed, you should consider invoking ''solve-field'' directly as that is simpler and more efficient than going through the ''ansvr'' HTTP interface.
+''ansvr'' is a wrapper around the [[http://astrometry.net/|astrometry.net]] plate solve command, ''solve-field''. If your client program is on the same machine where astrometry.net/ansvr is installed, you should consider invoking ''solve-field'' directly as that is simpler and more efficient than going through the ''ansvr'' HTTP interface.
 ===== Using solve-field directly =====
@@ Line 13: / Line 13: @@
 Replace the numbers after ''-L'' and ''-H'' with your low and high image scale estimates (arcsec per pixel). The solution will be in the file ''stars.wcs'' (FITS format). You can run ''%%solve-field --help%%'' to see all the available options.
-==== Using the HTTP interface ====
+===== Using the HTTP interface =====
 If you do want to use the HTTP interface, here are some notes on the subset of the nova.astrometry.net Web API implemented by ansvr.
@@ Line 20: / Line 20: @@
 Client request: ''POST /api/login'' \\
-Server response: ''"session":SESSION_ID''
+Server response: JSON object: ''{"session":"SESSION_ID"}''
     subsequent requests from the client pass the session id
@@ Line 31: / Line 31: @@
 <code>
-{"session":"17","allow_commercial_use":"d","allow_modifications":"d","publicly_visible":"y","scale_units":"arcsecperpix","scale_type":"ev","scale_est":1.2225129792992102,"scale_err":100.0}
+{"session":"SESSION_ID","allow_commercial_use":"d","allow_modifications":"d","publicly_visible":"y","scale_units":"arcsecperpix","scale_type":"ev","scale_est":1.2225129792992102,"scale_err":100.0}
 </code>
-''scale_est'' and ''scale_err'' are the key parameters; other params are ignored (except ''session_id''). The image scale is expected to be between ''scale_est - scale_err/100'' and ''scale_est + scale_err/100''
+''scale_est'' and ''scale_err'' are the key parameters; other parameters are ignored (except ''session''). The image scale is expected to be between ''scale_est - scale_est*scale_err/100'' and ''scale_est + scale_est*scale_err/100''
-The second part of the upload request is the image data (FITS format)
+The second part of the upload request is the image data (FITS file format)
 === submissions request ===
@@ Line 67: / Line 67: @@
 </code>
-==== Etc. ====
+===== Etc. =====
 I have a perl module that works as an ansvr or nova.astrometry.net client that is available if anyone is interested, but if you use the command line interface (''solve-field''), then you won't need it. I'd be willing to develop other language bindings if there is any interest.

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