Monday, April 18, 2011

Some analytical Hillshading algorithms

Pembuatan Peta Bayangan Gunung (hillshade) dari DEM dapat dikategorikan dalam dua metode, yaitu manual dan analytical. Manual shading berarti melakukan proses shading secara manual ............ Sedangkan analytical hillshading berarti....

[gambar contoh hillshading manual dan analytical]

Khusus untuk analytical hillshading, beberapa algoritma telah dikembangkan. Satu yang paling umum adalah algoritma.. yang diimplementasikan dalam kebanyakan perangkat lunak RS/GIS. Teknik - teknik yang lain, sebagian besar merupakan pengembangan dari teknik yang sudah ada. Teknik ...., misalnya, telah dikembangkan lebih lanjut menjadi beberapa varian seperti Swiss hillshading method dan MDOW hillshading. Masing - masing  algoritma memberikan hasil hillshading yang berbeda

Saturday, April 16, 2011

Simple way to adding Google Images services into ArcMap

I just found a simple way to add google images into ArcMap Project after exploring some RS/GIS forums. As we already know, since ArcGIS 9.2 we can access tiled services of basemaps from ESRI. This new feature permitted us to use worldwide detailed maps or high resolution imagery as our base map,data source or simply just background information of our mapping project. Then, We may further asking, could popular map/imagery service provider like google or microsoft also be added into ArcMap?. The answer is yes. codeplex has developed an ArcGIS extension called ArcBrutile, which it main goal is enabling tiled map/imagery services can be added into ArcMap. The extension can make WMS/WMS-C map services, Microsoft Bing and Google Images/Maps added into ArcMap view.

Below is example of my experiment:



Download the needed software from this forum.

Enjoy!!

Sunday, April 10, 2011

Creating automoved graphics and text in ArcMap Layout

Here is short tip to create automoved graphics or labels like annotation does in ArcMap. Normal graphics will not moved when we are trying to zoom or pan the data view in Layout mode. Sometimes it can bring serious problems when we are creating multi sheet or multi scale map. We can use manual way to move graphics (aargh, its time consuming), using annotation or converting graphics into shapes in order to make auto movable graphics/text. But trust me, that would not efficient if you re actually don't need annotation or additional meaningless data. better save your HD space folks!. Ok here are the tip sequences,

1. when you re in layout mode, activate the layout toolbar,





2. search "focus data frame" button, click it,

click to view detailed image

3. then create your text or graphic using drawing toolbar,

click to view detailed image

4. After it is done, try to pan or zoom the data view,the created graphics will automatically moved according to the panning/zooming direction (in this example image, the map moved to the down direction).

click to view detailed image

Hope this post is useful for you :D

Source : ESRI ArcGIS Desktop 9.3 web help

Monday, April 4, 2011

Copenhagen Image Processing System (CHIPS)

Chips, the Copenhagen Image Processing System, is a general-purpose software package for remote sensing image processing and spatial data analysis with extensive support for NOAA AVHRR data.

Chips can be used both as a stand-alone system, as well as a powerful supplemental image-processing tool for GIS products like MapInfo™ and ArcView™.









General purpose image processing with Chips for Windows®






































Multiple RGB/pseudocolor image views with both vector and raster overlays (ESRI shapes)









Vector editing and digitizing









Image rectification









Image classification









Image statistics and visualization of statistics









Image arithmetics, filtering, profiles, semivariograms, principal components, scattergram and interpolation









3D image visualization









Built-in scripting language



NOAA AVHRR processing with Chips for Windows®




































Imports and auto-detect multiple HRPT formats, including NOAA 1B, ESA Sharp, Dartcom, Quorum, BURS Block, Data Tools, ASDA, Dundee and Timestep.









Calibration and correction using NOAA NESDIS guidelines supported for all AVHRR platforms from TIROS-N to NOAA-16









Automatic rectification using embedded orbit parameters, TLE or TBUS files









Interactive navigation for improved accuracy









Line quality analysis handles missing or noisy lines









Creation of Sun and Satellite geometry images









Creation of vegetation indices and surface temperature maps through user-defined algorithms









Bushfire detection  

At this moment, Chips is no longer supported,and can be downloaded free of charge at this site. And the manual could be found here.