PostGIS Raster : Extending PostgreSQL for The Support of ... - CoDE

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Time Travel The time travel feature is available through a separate window. This window is divided into three main areas: time , media and band areas. The time and media areas gather all of the necessary options for controlling the evolution in time of temporal raster data. The band area relates to the band properties. Time Area Figure 6.5: Time travel interface. As shown in the time region, the first slider bar represents the evolution in time of a set of loaded temporal rasters. The interval between two ticks represents the minimum time interval between two any temporal rasters. It is expressed in day unit and its value can be changed from the spin box Time interval. Just behind these ticks, on the left side is the minimum time instant and on the right side is the maximum time instant that exists in the temporal raster set. The current time field indicates the current time instant of the evolution as the slider moves. The Begin time and End time fields express the evolution time interval in which all the temporal rasters that have a time instant included in this interval will be counted in the evolution. For example, user may choose to view the evolution beginning at some particular time instant (2001-07-13 08:17:34 in the figure) by entering this time instant in the Begin time field. Otherwise, it can be taken from the calendar button, located just next to the Begin time field. The same for the End time field. Media Area The media area offers different ways to control the evolution : move forward to next temporal raster (or map), move backward to previous map, move to begin map, move to final map, play and stop temporal raster evolution (or movie). Furthermore, the second slider bar help user change the speed of the movie. This speed varies from minimum 0.05s to maximum 2s. Band Area It depends on the number band that each raster possesses, the application proposes appropriate options. In the one band case, the raster is a gray image because each pixel point is expressed by a single value. Hence, the application provides user the possibility to load a color palette from a palette file (Load a style field). The palette file is created from the color legend button (this feature is described later). When rasters have multiple bands (color images), users have possibilities to view overlapping multiple bands (Multi Band Color radio button) or each band individually ( Single Band Color radio button). If the Single Band Color radio button is marked, a compose box with a list of band numbers will appear to help user choose to visualize a desired band. The Single Band radio button (respectively Multi Band radio button) is not an option for users. It is used to inform users if rasters are single band (respectively multi band). Both of them are 75
Figure 6.6: Band area. controlled by the application and choices made by users on these options have no effect either on Multi Band or Single Band£ button. 6.2.2 Color Legend The color legend is used to indicate the significance of color by numbers. It consists of a title, a color bar and a common unit for numbers and tick notations. In the example below, the red color area expresses high temperature and the blue color area expresses low temperature. Figure 6.7: The temperature color legend. As each temporal raster is a matrix of values of points in space, hence it is referred to as a map. Each map possesses normally a minimum value and a maximum value. If Time travel is an application that shows the evolution of a set of maps, then the color legend representing all these maps needs to be computed from this set. It does not make sense when the color legend of a specific map is used for a set of maps. This also means that the minimum value (respectively maximum) at the bottom (respectively top) of the color legend is the minimum value of a set of maps. The color legend is available through another window than Time travel window. The Output color - palette file field let user enter the desired name for the created color palette file. In the Color palette region, the left compose box contains all of the available color palettes that help users to freely choose a satisfied one. Behind this box, the chosen color palette is shown. The Apply button aims to apply the chosen palette to the current map for users to visualize, along with creating a corresponding color palette file with the name given by the Output color palette file field. Users can repeat this step as many times as the number of existing palettes. Once a color palette file is created, its name is registered in the Created color palette(s) compose box. On the one hand, these color palette files serve as style files for maps and are used to create corresponding color legends on the other hand. Finally, the Create button creates the color legend of the current color palette file. The result of the color legend is simply a PNG image file. 6.3 Implementation The application is developed as a plugin [12] in QGIS using PyQt, the bridge between Python and Qt4 graphics library. 76
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Faculté de Sciences Appliquées Se
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Abstract Nowadays, in many applicat
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3.2.4 Overlapping Raster and Vector
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D.5 Geology, Geophysics and Geochem
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4.9 Raster cell [16]. . . . . . . .
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Chapter 1 Introduction 1.1 Context
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Chapter 2 Geographic Information Sy
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2.2.3 Imagery Figure 2.3: Polygon f
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Figure 2.8: Surface expressed by co
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4-foot logo. The file size is the s
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2.4.2 Data Theme Figure 2.14: Multi
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measures of latitude. Longitude mea
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2.6 GIS Applications 2.6.1 Crime Ma
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2.6.3 Traditional Knowledge GIS Tra
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These additional functionalities ma
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Figure 3.3: Physical storage of Geo
Page 33 and 34: DROP INDEX spain_images_idx; CREATE
Page 35 and 36: In summary, the intersection is muc
Page 37 and 38: Attribute information Table 4.1: Po
Page 39 and 40: Figure 4.2: Information representat
Page 41 and 42: for discrete data while floating-po
Page 43 and 44: the matrix are parallel to the x-ax
Page 45 and 46: Lines Figure 4.15: Raster point rep
Page 47 and 48: Choosing an appropriate cell size i
Page 49 and 50: The multi-band conception is result
Page 51 and 52: "32BUI" = 32-bit unsigned integer "
Page 53 and 54: Figure 4.30: Pyramids at different
Page 55 and 56: ectangular because there might be s
Page 57 and 58: Figure 4.39: Vector to raster conve
Page 59 and 60: Figure 4.42: Web application with o
Page 61 and 62: In this example, the dummy_rast tab
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Page 65 and 66: 4.19 Intersection The fact that Pos
Page 67 and 68: Figure 4.51: Raster and raster inte
Page 69 and 70: ST_Present and ST_Passes predicates
Page 71 and 72: Chapter 5 User Guide Sometimes stor
Page 73 and 74: SELECT rast As origin, ST_Resample(
Page 75 and 76: • gvSIG plugin • MapServer thro
Page 77 and 78: SELECT ST_AsJPEG(rast) As rastjpg F
Page 79 and 80: FROM buff_temp GROUP BY id ORDER BY
Page 81 and 82: Chapter 6 Application Most of GIS a
Page 83: 6.2 Tools Figure 6.3: PostGIS conne
Page 87 and 88: Figure 6.10: The loading map parall
Page 89 and 90: Figure 6.14: Maps representing worl
Page 91 and 92: Figure 6.17: Maps with a color lege
Page 93 and 94: their levels of awareness of geogra
Page 95 and 96: [15] Jorge Arevalo. PostGIS Raster
Page 97 and 98: Appendix A PostGIS Raster Utilisati
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Page 101 and 102: Appendix C Code Implementation C.1
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Page 107 and 108: D.4 Digital Image Processing D.4.1
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