THE USE OF VHR REMOTE SENSING IMAGERY FOR THE IDENTIFICATION OF ROOFS POTENTIALLY SUITABLE FOR THE INSTALLATION OF PHOTOVOLTAIC PANELS ORFEO PLEIADES
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1 THE USE OF VHR REMOTE SENSING IMAGERY FOR THE IDENTIFICATION OF ROOFS POTENTIALLY SUITABLE FOR THE INSTALLATION OF PHOTOVOLTAIC PANELS ORFEO PLEIADES December 8 th, 2010
2 OBJECTIVES Develop a method to automatically identify roofs suitable for the installation of photovoltaic panels. Assess the possibilities of VHR image processing. Assess the analytical abilities of OTB-Monteverdi software. 1/24
3 MATERIALS Images QuickBird images (Toulouse, France) Image processing software OTB Monteverdi v.1.0 IDRISI Andes v.15.0 GIS software MapInfo v.8.0 2/24
4 IMAGE GENERATION To generate suitable images Fusion made with OTB-Monteverdi + = 1 band R = 0.61 m 4 bands 4 bands R = 2.44 m R = 0.61 m 3/24
5 IMAGE GENERATION Images suitable for processing Very long generation time High-performance computer required 4/24
6 IMAGE CLASSIFICATION To extract roofs from the image 3 main roof classes: Red = tiles White = steel Grey = asphalt or fibrocement 5/24
7 IMAGE CLASSIFICATION Many other classes Roads Bare soil Vegetation Shadows Water OTB = 2 classification methods Object-based Per-pixel 6/24
8 IMAGE CLASSIFICATION : Global KIA Object and pixel = equivalent results Quality depends on heterogeneity 7/24
9 IMAGE CLASSIFICATION : Specific KIA Red and white roofs often well classified 7/24
10 IMAGE CLASSIFICATION : Specific KIA Red and white roofs often well classified Grey roofs often misclassified 7/24
11 IMAGE CLASSIFICATION Confusions Grey roofs/roads same coating 8/24
12 IMAGE CLASSIFICATION Confusions Grey roofs/roads same coating Grey roofs/roads/shady red roofs 8/24
13 IMAGE CLASSIFICATION Confusions Grey roofs/roads same coating Grey roofs/roads/shady red roofs Red roofs/bare soil 8/24
14 IMAGE CLASSIFICATION with indexes RI, PSI and Length Equivalent to per-pixel approach 9/24
15 IMAGE CLASSIFICATION Problems 2 approaches = equivalent results Roof s form and surface accurate enough Indexes adding significant improvement In these conditions, how to answer the question? 10/24
16 IMAGE CLASSIFICATION Adding information High Resolution DEM Second VHR scene Masking other classes Cadastral plan Topographic database 11/24
17 IMAGE CLASSIFICATION Adding information High Resolution DEM Second VHR scene Expensive Masking other classes Cadastral plan digital version not always available Topographic database : BD TOPO IGN suitable characteristics, cheap 11/24
18 MASKING BD TOPO vector raster (IDRISI) Band math + concatenate (OTB- Monteverdi) 12/24
19 MASKING : Global KIA Benefits to heterogeneous areas 13/24
20 MASKING : Specific KIA Red and white roofs = equivalent results 13/24
21 MASKING : Specific KIA Red and white roofs = equivalent results Grey roofs = improvement in each area 13/24
22 MASKING Titre diapo Titre diapo Titre diapo 14/24
23 GIS treatment DATA CORRECTION Vectorize classification Class extraction for treatment Assign a unique class 1 roof = often many classes B V R Class 1 Class 2 Class 3 15/24 Labell BD TOPO Polygons from classification = not suitable for treatment
24 GIS treatment DATA CORRECTION Superposition: classified shape/image Success rate > 90% Succes rate with grey class dissociation ~80% Class Detected Well qualified Rate of correct qualification Red % White % Grey % Total % Downtown Class Detected Well qualified Rate of correct qualification Red % White % Grey % Total % Industrial park 16/24
25 GIS treatment CONTIGUOUS BUILT DETECTION Based on 3 criteria Class (red or grey) Surface (>250 m²) Polygon smoothness (red >15 faces; grey > 30 faces) Complex detection Strongly depending on thresholds Omission / Over-selection risk Unlikely contiguous Likely contiguous 17/24
26 GIS treatment DISTANCE TO PROTECTED SITES Based on a buffer Restriction = 500 m Protected site layers available Easy detection Restricted area Restricted polygons Not restricted polygons 18/24
27 GIS treatment SLOPE ASSIGNEMENT Linked to the class Source: Regulatory documents Slaters Roof ridges not detectable: Roofs with many slopes? Red = 25 to 35% (Toulouse ~ 33%) White Steep grey = 5 to 8% Flat grey =0% 19/24
28 GIS treatment SURFACE AREA CALCULATION Corrected by slope Real area = calculated area / cos (slope ) Roof s ridge not detectable Postulate: available surface = ½ surface Only for ideal roofs total 20/24
29 GIS treatment ORIENTATION CALCULATION Based on each face s azimuth Interesting azimuths L(interesting faces)/perimeter Ratio > 0.5 Roof s ridges not detectable Postulate: the ridge follows the roof s length Only for ideal roofs Interesting Not interesting 21/24
30 CRITERIA Area = 15 km² and polygons Red and white roof s surface area > 1400 m² Grey roofs surface area > 700 m² Contiguous built = unlikely Checked by a technician from a firm specialised in installation of solar panels 22/24
31 FINAL RESULTS Rate of commission = 48.6% Method\Truth Suitable roofs Unsuitable roofs Total Commission error Suitable roofs Unsuitable roofs Total Omission error /24
32 FINAL RESULTS Rate of commission = 48.6% But Rate of omission = 2.6% Method\Truth Suitable roofs Unsuitable roofs Total Commission error Suitable roofs Unsuitable roofs Total Omission error /24
33 FINAL RESULTS Rate of commission = 48.6% But Rate of omission = 2.6% Rate of correct qualification = 97.6% Method\Truth Suitable roofs Unsuitable roofs Total Commission error Suitable roofs Unsuitable roofs Total Omission error /24
34 METHOD Reduces the amount of work Quite good precision Powerful computer required OTB-MONTEVERDI Many indispensable tools Good quality and fast «pixel» classification «Object» does not work with mask 24/24
35 VHRS IMAGES Large area covered Sufficient resolution Cannot efficiently identify roofs without complementary information THANK YOU 24/24
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