Thanks Hernan!

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I will try to find out what the problem is with your shape file.

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Btw is the code for reading/writing dbf files already available on github?

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Hans

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From: Hern��n Morales Durand <hernan.morales@gmail.com>
Sent: vrijdag 5 juni 2020 0:25
To: Any question about pharo is welcome <pharo-users@lists.pharo.org>
Subject: Re: [Pharo-users] GIS support for Pharo

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Hi Hans,

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El jue., 4 jun. 2020 a las 6:07, Baveco, Hans (<hans.baveco@wur.nl>) escribi��:

Would be an interesting project..

An old link to possibly still useful code:

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http://wiki.squeak.org/squeak/3317

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Btw the shapefile support, from the ESRI spec, was done by me and is still available on http://www.squeaksource.com/@CUT95k_uXmPU4uXY/HCmgtrop.

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Thank you for the clarification (and actually sharing your work with ESRI files!)

I added proper credits in the Github forked repo : https://github.com/hernanmd/Shapes

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I use it daily. I may have some fixes/additions, but in general the code as provided works well (I suppose the code at smalltalkhub is still mostly the same). Some shapefile formats are still missing, mostly because I never encountered them..

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You mean some types are missing? Because I get this error when I try to read some SHP files: "Types > 20 are not yet accounted for"

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I wrote this script to reproduce:

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��| shpE legend urlRoot urlESRIFilePrefix urlESRIFileShp urlPath response fileRef |

" Download Shapefile resources "
urlRoot := 'https://github.com/nvkelso/natural-earth-vector/blob/master/110m_cultural/'.
urlESRIFilePrefix := 'ne_110m_populated_places'.
urlESRIFileShp := urlESRIFilePrefix , '.shp'.
urlPath := urlRoot , urlESRIFilePrefix.

#('.shx' '.dbf' '.shp') do: [ : ext |
| url |
url := ��(urlPath , ext , '?raw=true') asZnUrl.
(response := ZnEasy get: url) isSuccess
ifFalse: [ self error: 'Cannot download file' ].
fileRef := FileSystem disk workingDirectory / (urlESRIFilePrefix , ext).
fileRef writeStreamDo: [ : stream |
stream nextPutAll: ((ZnByteEncoder newForEncoding: 'koi8r') decodeBytes: response contents ) ] ].

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Once downloaded:

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| urlESRIFilePrefix urlESRIFileShp shpE |
urlESRIFilePrefix := 'ne_110m_populated_places'.
urlESRIFileShp := urlESRIFilePrefix , '.shp'.

" Load and display it in Morphic "
shpE := ShapeEnsemble fromFile: urlESRIFileShp.

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Maybe it's related with the fact they are encoded as koi8r?

I checked with Zinc downloading first from the browser:

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| shpFile | �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� ��
shpFile := 'ne_110m_admin_0_countries.shp' asFileReference.
[ shpFile binaryReadStreamDo: [ : in |
�� �� �� �� �� �� �� �� (ZnCharacterEncoder detectEncoding: in upToEnd) identifier ] ]
�� �� �� �� on: ZnCharacterEncodingError
�� �� �� �� do: [ nil ].

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Cheers,

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Hern��n

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To read a complete shapefile one also needs to read dbf files. This was another substantial effort http://www.squeaksource.com/@Y4HhnL90iyA2TmAb/X0sPqshM; luckily ��there was an older implementation.available to build upon.

Not sure whether nowadays there are other ways to read/write files old DBASE format files...

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Cheers,

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Hans Baveco

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From: Serge Stinckwich <serge.stinckwich@gmail.com>
Sent: donderdag 4 juni 2020 5:32
To: Any question about pharo is welcome <pharo-users@lists.pharo.org>
Subject: [Pharo-users] GIS support for Pharo

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Dear all,

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there was already some discussion in the list about GIS support for Pharo previously.

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Working on CORMAS multi-agent simulation platform: https://github.com/cormas/cormas some developers feel the need to have more GIS support for Pharo.

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I know of existing GIS software:

- GeoJSON by Zweidenker: https://github.com/zweidenker/GeoJSON

- ESRI ascii raster, done by Stephane recently: https://github.com/Ducasse/ESRI-ASCII-Raster

- shapefile support by Hernan: http://smalltalkhub.com/#!/~hernan/Shapes

(to be moved to github)

- I found this project also: http://www.squeaksource.com/gekon.html

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I know that Etienne Delay is also interested by GIS support and propose to implement OpenGIS model support: https://github.com/cormas/cormas/issues/139

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Can we try to unite and maybe create a pharo-GIS organization on github to federate our efforts?

Cheers,

--

Serge Stinckwic

h

https://twitter.com/SergeStinckwich

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