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a new #GIS #journal

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Introducing GeoServer

#GeoServer #WebGIS

GIS Enthusiast

GeoServerWebServer, WebClient

A server is a program that awaits and fulfills requests from client programs in the same or other computers .

On the other hand a Web Server is the computer program which serves requested HTML pages or files . This request is sent from a program associated with the user, well known as a Web Client.

The above is just a preamble to make us understand the working of GeoServer application.

GeoServer is a powerful map and feature server for sharing, analyzing and editing geospatial data sources using open standards. Written in Java and is designed for interoperability, publishing data from any major spatial data source in form of single or integrated map. GeoServer is a web server for geo content. It reads spatial data in a variety for formats, and pushes that data onto the web. Just like a web server reads other types of…

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GIS Data Formats

vector, raster in #GIS

GIS Enthusiast

GIS data format specifies how geospatial data is stored in a file. The format describes the logical structure used to store geospatial data within the file. Geospatial data simply refers to spatial data that has been georeferenced. Spatial data is that contains information about position. There are two main types of GIS data formats,namely:

  • Raster Data Formats
  • Vector Data Formats

Raster data formats are generally used to store bitmapped images. It consists of rows and columns of cells or pixels with each representing a single value. Commonly used raster data formats include,Digital Elevation Model (DEM), used for recording and storing elevation data, Digital Raster Graphic (DRG), used to store digital scans of paper maps,Band Sequential (BSQ), Band Interleaved by Pixel (BIP), Band Interleaved by Line (BIL), these are used for Remote Sensing Systems.
Vector data formats tend to store only geometric primitives including points…

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The Shapefile File Structure

#ArcGIS, #SHP, #GIS

GIS Enthusiast

Shapefile is an open specification developed by ESRI for storing and exchanging data. A shapefile consists of a collection of files all with the same base name. At a minimum, there are three basic files required for a valid shapefile. They include .shp, .shx and .dbf files. However, they can be as many as 15 different files.

  1. .shp, it contains the geometry information. This is with respect to point, line or polygon.
  2. .shx, this is the shape index file. It references the geometry for faster access.This means that this file is meaningless without .shp file.
  3. .dbf, this is the database file. It contains the geometry attributes. The .dbf files can be opened by most types of spreadsheet software.
  4. .prj, it contains the projection information in Well-Known Text format and is required for on-the-fly projection by most GIS software.
  5. .sbn, it is the spatial bin file, Shapefile spatial…

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Call for papers: ISPRS International Journal of Geo-Information

#call-for-papers

Geomatics @ TU Delft

ijgi-logo

The ISPRS International Journal of Geo-Information – ISPRS IJGI (ISSN 2220-9964) has recently been included in Web of Science. All volumes will be covered by WoS.

There will be a Special Issue entitled “Bridging the Gap between Geospatial Theory and Technology”. On behalf of Dr. Songnian Li, Prof. Dr. Suzana Dragicevic, Dr. Xiaohua Tong, Guest editors, we are inviting a contribution from you (a long review or research paper).

Special Issue Website:
http://www.mdpi.com/journal/ijgi/special_issues/TCII_Symposium
Submission deadline: 31 August 2015
Journal Homepage: http://www.mdpi.com/journal/ijgi

Topics of interest include:
– Geospatial computation, geo-design and geospatial simulation
– Geographical decision support systems and decision theory
– GIS systems analysis, design and implementation
– Web-based methods and systems for spatial information dissemination
– GIS and applications (social, physical, environmental and health)

Please do not hesitate to reach me at ijgi@mdpi.com or yuanyuan.yang@mdpi.com, should you have any questions or comments. We are looking forward to receiving your contribution for this event.

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GIS Data QA/QC with ARcGIS Data Reviewer

Steve Omondi blogging ’bout ArcGIS Data Reviewer Extension, worth reading …

gw sebenarnya pengen nyambungin RapidMiner dengan ArcGIS … tapi blon kesampaian … barangkali ada yang berminat oprek-oprek?

GIS Digest

In this week’s Into-the-ArcGIS-System Series we take a look at GIS Data Quality Assessment/ Quality Control (QA/QC) with the ArcGIS Data Reviewer Extension. This is one of the tools that GIS Data managers should befriend to help improve the quality and integrity of their data. This will go further to all the other departments that consume this data or your clients who depend on the map products of these data.

The quality and hence usefulness of GIS information products is a function of the accuracy of the data. ArcGIS Data Reviewer is an extension built to provide very robust procedures to help organizations identify and manage errors in GIS data and automate data-validation workflows. In this article we will briefly walk through what you should expect from this extension (ArcGIS Data Reviewer). This article is for the following individuals;

  • GIS professionals who edit, maintain, or perform quality assurance/quality…

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Create MapServer Tile Image for Google Map API v3

Ever since google updated their Google Map API into version 3 (probably around 2010), output generation sample code in page 463 on MapServer Documentation, Release 6.4.1 were not working anymore, and it had been frustrated me. I love that image tiling approach which will save tons of bandwidth and processing time for my MapServer.

Tonight, I manage to playing around and looking for sample code that google provided here.

If  you’re willing to put your MapServer tiled images (instead of custom divs provided in that sample), the only thing that you need to do is to change this function:

CoordMapType.prototype.getTile = function(coord, zoom, ownerDocument) {

comment or delete everything there (within that function), and change it with your own image provided by your MapServer tiled image:

var url = “http://localhost:81/cgi-bin/mapserv.exe?”;
url += “map=/ms4w/apps/belajar/kampar04/kampar.map&”;
url += “mode=tile&”;
url += “layers=jalan&”;
//url += “layers=layer1 layer2&”;
url += “tilemode=gmap&”;
url += “tile=” + coord.x + ” ” + coord.y + ” “+zoom;

var myMapServerTile = ownerDocument.createElement(‘img’);
myMapServerTile.src= url;
return myMapServerTile;

VOILA … it’s now fully working …

p.s: change http://localhost:81 and the rest of URL into your MapServer’s map file.

basic map types

GIS For Biologists: Tip #6 – How To Transform A Data Layer Into A Different Projection/Coordinate System

GIS In Ecology

Most of the common problems that people encounter when using GIS for biological purposes are caused by one, or more, data layers not being in the same projection/coordinate system (also known as the coordinate reference system of CRS, depending on the GIS software that you are using) as either the GIS project itself, or other data layers in the GIS project. This means that once you have set your projection/coordinate system for your GIS project (see video tip #4) and added data layers to your GIS project (see video tip #5), you may need to transform one or more of them into a different projection/coordinate system, and more specifically into the same projection/coordinate system as your GIS project, before you can do anything with it.

Transforming a data layer from projection/coordinate system to another is easy to do, and can done in a similar way in most GIS software…

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New paper: Footprints in the sky – using student track logs in Google Earth to enhance learning

now we know how important is to track your student …

Po Ve Sham - Muki Haklay's personal blog

screen shot for paperIn 2011-2012, together with Richard Treves, I was awarded a Google Faculty Research Award, and we were lucky to work with Paolo Battino for about a year, exploring how to use Google Earth tours for educational aims. The details of the projects and some reports from the project are available on Richard’s blog, who was leading on many aspects of the work. Now, over 2 years since the end of the project, we have a publication in the Journal of Geography in Higher Education. The paper, titled ‘Footprints in the sky: using student track logs from a “bird’s eye view” virtual field trip to enhance learning’, is now out and describes the methodology that we developed for tracking students’ actions.

The abstract of the paper is:

Research into virtual field trips (VFTs) started in the 1990s but, only recently, the maturing technology of devices and networks has…

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GIS Lecturer, in Bahasa (Indonesian)