Skip to main content

Maps Without Dedicated Server

Geographical Information System (GIS) was designed for engineers. That was good because engineers always work with standards which make interfaces open. Web Map Service (WMS) is one of the open interface standards. WMS focuses on maps portrayal via the Internet. A WMS client will request map graphics from the server which acquires, stores and prepares the maps using GIS back ends. A WMS server can be a full blown GIS engine or it can just be a gateway for other GIS engine.

Due to the GIS engineering perspective, many GIS implementation was done by hardcore programmers who work with C/C++ or Java programming languages. The legacy survives till today. The choice of programming language determines the type of server the GIS requires. Unfortunately, most GIS implementations only work with dedicated servers which incur high operating cost. A dedicated server need a special work force to overlook on the daily operation.

We have to be realistic if we want to bring GIS into the mainstream. Initial cost can be a ticked off. I have friends who keep on coming to me asking for GIS solutions. They simply could not bear the cost. I said to them over the years I had been trying to find some solutions that will reduce the cost. I even have an open source solution stack for GIS. However, my solution requires a dedicated server. A dedicated server may not be really an issue. What will be an issue is when they want to see a demo. They hadn't invested anything and they wanted to have a demo. And I have to get a dedicated server up, stuff the GIS solution stack and upload some spatial data just to show a demo, which nobody will pay. If I tell them that there are a lot more to do then they will go away. I just told them there were really a lot more to do to implement GIS.

There was a case when a dedicated server I was working on a GIS project was taken away.

How can I implement a GIS without a dedicated server? A cloud solution can still be expensive in term of time and money. How about a shared web hosting server? The PHP programming language and MySQL database are usually available on shared web hosting server. PHP has never been treated on par with C/C++ or Java. And the MySQL database will not be installed with any spatial indexing engine. Well, PostGIS for MySQL is not yet full blown. No, we are not allowed to have the PostGIS on MySQL in a shared web hosting server. Anyway, I built Camar using PHP and plain MySQL.

Camar is a WMS server with GIS back ends and should be able to run on any shared web hosting server with PHP and MySQL. I can now create GIS demos with no worries on missing servers. In fact, I can co-locate many Camar implementations on the same shared web hosting server.

Comments

Popular posts from this blog

Setting Up PyScripter for Quantum GIS

PyScripter is a general purpose Python Integrated Development Environment (IDE). Quantum GIS (QGIS) is a desktop GIS application that can be extended with Python plugins. Both are open source softwares. We intend to use PyScripter as an IDE to build QGIS Python plugin. We are using PyScripter 2.4.1.0 and QGIS 1.6.0 in Windows. PyScripter does not come with Python. On the other hand, QGIS is built in with Python. Thus, we will setup up PyScripter to use the build in Python in QGIS. We assume both PyScripter and QGIS are already installed. Preparing PyScripter batch file We assume that QGIS is installed in C:\OSGeo4W\ folder and PyScripter is installed in C:\Program Files\PyScripter\ . 1. Copy qgis.bat in C:\OSGeo4W\ bin to pyscripter.bat 2. Edit pyscripter.bat to remove the last line that read something like this start "Quantum GIS" /B "%OSGEO4W_ROOT%"\apps\qgis\bin\qgis.exe %* and replace it with this in one line Start "PyScripter" /B "C:\Progr

Sending Emails via SMTP

msmtp  requires a minimal setup for sending emails via SMTP compared to sendmail. Here is a configuration for you to send emails from a web host to an external SMTP server. Prior to doing that, you must check whether there is a clear communication channel between your web host and the SMTP server. You can use Telnet . Set up msmtp You are going to set msmtp as an MTA . Hence, you need to remove all other MTAs such as postfix and sendmail: $ sudo apt-get --purge autoremove postfix sendmail Install msmtp and related utilities: $ sudo apt-get install msmtp msmtp-mta mailutils Configure msmtp: $ sudo nano /etc/msmtprc # Set default values for all following accounts. defaults # Use the mail submission port 587 instead of the SMTP port 25. port 587 # Always use TLS. tls on # Set a list of trusted CAs for TLS. The default is to use system settings, but # you can select your own file. tls_trust_file /etc/ssl/certs/ca-certificates.crt # The SMTP server account mx host mail.mx.example

fatal: Couldn't find remote ref master

If you are using Github then  master is now known as main . Whatever you want to do with a master must now be referred to a main . If you search for this error message on the Internet then you will encounter with a lot of old discussions on how to set up your master properly which is probably not what you are looking for. The master  is your problem. Rename it to main . I wrote Git My Way about two years ago. Today I created another Github repository. I got this  "fatal: Couldn't find remote ref master"  error message when I wanted to sync the new repo for the first time with my notebook using the notes I wrote in the blog. All the discussions around the error message I found on the Internet were perplexing. Then I recalled that Github had renamed master to main  due to the master-slave connotation. We always have a master copy of a code, never a slave copy. Now suddenly a word context has been diminished for good. What is going to happen to the existing vast documen