[mapserver-users] Fwd: Zoom to something and display in one shot from MapServer CGI.

[Dan Little]

You're likely better off with a simple script that computes the bounding
box and then uses mapserver to render the map.

E.G.: /cgi-bin/parcel-view.py?PIN=[xyz]

def getParcelBBOX(conn, pin):


On Tue, Jul 11, 2017 at 11:22 AM, Basques, Bob (CI-StPaul) <
bob.basques at ci.stpaul.mn.us> wrote:

>
>
> Hi Steve,
>
> I want to send a CGI request like :  ServerName?pin=202923230045
>
> And zoom to the pin (parcel polygon) in the returned image and also add a
> buffer percentage.  This is for a reporting application.  I can do it with
> an intermediate service, but it’s been awhile since I did this, and was
> wondering if anything new in MapServer might help with this for a single
> pass approach.
>
> The zoom parameters would be hardcoded into the MapFILE in an ideal world,
> I can build an SQL for this for example, but I recall I couldn’t use the
> BBOX returned from the SQL as a BBOX for Mapserver parent call, my memory
> is cloudy on that capability from MapServer though, hence the question.
> Now that you have me talking it through though, I think the last time I
> asked about this it was to inquire about possibly chaining more than one
> MapServer call together to get the result.  I think there were fears at the
> time about possible runaway processes being created . . . .
>
> bobb
>
>
> On Jul 11, 2017, at 10:38 AM, Stephen Woodbridge <woodbri at swoodbridge.com>
> wrote:
>
> On 7/11/2017 10:39 AM, Basques, Bob (CI-StPaul) wrote:
>
> All,
> It’s probably because it’s Tues. but I think I’ve asked this before in the
> past . . .
> I have a DB with PIN numbers for PARCELS and I want to be able to
> auto-zoom(with buffer)  to a PARCEL by just sending in a PIN number via CGI.
> can the BBOX be pulled from the DB based on the geom in one shot?  I’ve
> done this in the past with a Webservice that went and grabbed the BBOX
> separately, then assembled the url for getting the graphic back from
> Mapserver.
>
>
> Bobb,
>
> What are you trying to zoom? the image or the client?
>
> If it is the client then how is mapserver on the server supposed to tell
> the client it needs to zoom? You have to query the server to get the bbox
> then make the client zoom appropriately.
>
> For the image, assuming you want a static image showing the parcel, then I
> would write a php/python/perl script the you pass the PIN to and it does
> the work to figure out the extents and return the image.
>
> -Steve W
>
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