DCG3083 : PHOTOGRAMMETRY

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SECTION A : 50 MARKS BAHAGIAN A : 50 MARKAH INSTRUCTION: This section consists of TWO (2) structured questions. Answer all questions. ARAHAN: Bahagian ini mengandungi DUA (2) soalan struktur. Jawab semua soalan. QUESTION 1 SOALAN 1 (a) Photogrammetry has been defined as an art, science, and technology of obtaining reliable information about physical objects and the environment. Fotogrammetri ditakrifkan sebagai seni, sains dan teknologi dalam pengumpulan maklumat sebenar tentang objek fizikal dan alam sekitar. (i) Briefly describe main branches in photogrammetry. Secara ringkas terangkan cabang utama dalam fotogrametri. (ii) Briefly describe aerial survey method. Secara ringkas terangkan kaedah pengukuran di udara. (b) The fundamental device in the field of photogrammetry is the camera. Sketch and label aerial camera. Discuss clearly the component of magazine. Peralatan asas dalam bidang fotogrametri adalah kamera. Lakar dan labelkan kamera udara serta bincangkan tentang komponen lelopak. [ 15 marks ] [ 15 markah ] 2 SULIT

QUESTION 2 SOALAN 2 (a) State the factors to be considered in flight planning for clear and quality overlap aerial photo image. Nyatakan faktor-faktor yang harus dipertimbangkan dalam perancangan penerbangan bagi mendapatkan foto udara bertindih yang berkualiti dan jelas imejnya. (b) The airbase of a stereo pair of vertical photos is 1300 m and flying height above average ground is 2500 m. The camera has a focal length of 152.4 mm and a 23 cm format. Calculate the percent of end lap. Bes udara bagi pasangan stereo foto pugak adalah 1300 m dan tinggi penerbangan pada aras purata permukaan bumi adalah 2500 m. Kamera mempunyai jarak focus 152.4 mm dan formatnya adalah 23 cm. Kirakan peratus tindihan hadapan. (c) In the flight planning work for a shooting aerial photogrammetry for mapping an area of area 30 km x 25 km, the following data were given :- Dalam kerja perancangan penerbangan untuk satu penggambaran foto udara untuk tujuan pemetaan fotogrametri satu kawasan yang berkeluasan 30 km x 25 km, data-data yang berikut telah diberi :- End lap (Tindihan hadapan) = 65% Side lap (Tindihan sisi) = 25% Camera format (Format kamera) = 152 mm x 230 mm x 230 mm Photo scale (Skala foto) = 1: 25000 3 SULIT

From the given data, calculate :- Daripada data yang diberi, hitungkan :- (i) Flying height ( Tinggi penerbangan ) (ii) The number of aerial photo per strip ( Bilangan foto udara sejalur ) (iii) The number of strip ( Bilangan jalur penerbangan ) (iv) The number of aerial photo ( Bilangan foto udara ) [15 marks] [ 15markah ] 4 SULIT

SECTION B : 50 MARKS BAHAGIAN B : 50 MARKAH INSTRUCTION: This section consists of FOUR (4) structured questions. Answer TWO (2) questions only. ARAHAN: Bahagian ini mengandungi EMPAT (4) soalan struktur. Jawab DUA (2) soalan sahaja. QUESTION 1 SOALAN 1 (a) Define and list the characteristics of Perspective Projection. Berikan definisi dan senaraikan ciri-ciri Unjuran Perspektif. (b) In spite of level vials and other stabilizing equipment, in practice it is impossible to maintain the optical axis of the camera truly vertical during exposure. This will cause the rotation of the camera axis. Referring to this statement. Walaupun terdapat kelengkapan alat aras dan penstabil, tetapi memang sukar untuk mendapatkan paksi optik benar-benar tegak semasa dedahan dilakukan. Ini akan menyebabkan putaran pada paksi kamera. Merujuk kepada kenyataan ini : (i) Identify the tilted photo and illustrates with the aids of suitable diagram. Kenalpasti foto senget dan gambarkan dengan bantuan rajah yang sesuai. [ 4 marks ] [ 4 markah ] (ii) Illustrates the individual of rotation omega (ω), phi (φ) dan kappa (κ) at x, y and z axis. Gambarkan secara individu putaran omega (ω), phi (φ) dan kappa (κ) pada paksi x, y dan z. [ 6 marks ] [ 6 markah ] 5 SULIT

(c) (i) A line PQ measures 130 mm on an aerial photo taken with a camera having a focal length of 15.24 cm. The same line measures 5.2 cm on a map drawn to scale of 1:43000. If the average altitude is 320 m, calculate the flying height of the aircraft. Satu garis PQ berukuran 130 mm pada fotoudara telah diambil dengan kamera yang mempunyai jarak fokus 15.24 cm. Garis yang sama (PQ) berukuran 5.2 cm pada peta yang berskala 1: 43.000. Jika ketinggian purata ialah 320 m, Kirakan tinggi penerbangan pesawat berkenaan. (ii) The distance from the principal point to an image R on an aerial photo is 54 mm and the elevation of the object above the datum is 450 m. Calculate the relief displacement of the point R if the photo scale is 1:7800 and the focal length of camera is 15.24 cm. Jarak dari titik utama kepada imej R pada fotoudara ialah 54 mm dan ketinggian objek berkenaan di atas datum adalah 450 m. Kirakan anjakan relif titik R jika skala foto adalah 1 : 7800 dan jarak fokus kamera adalah 15.24 cm. 6 SULIT

QUESTION 2 SOALAN 2 (a) Define Coordinate Transformation. Beri definisi Transformasi Koordinat [5 marks] [5 markah] (b) State THREE (3) steps involved in the transformation of the basic 2-dimensional conformal coordinate and discuss briefly TWO (2) conditions conformal coordinate transformation matrix solution. Nyatakan TIGA (3) langkah yang terlibat dalam transformasi koordinat konformal asas 2 dimensi dan bincangkan secara ringkas DUA (2) syarat penyelesaian matriks transformasi koordinat konformal. (c) Table B2 shows the data of arbitary coordinate system and ground coordinate system. Referring to the given data, create matrices and transfer into a form of simultaneous equations to obtain the coordinates of the point A on the earth. Jadual B2 menunjukkan data untuk sistem koordinat sembarangan dan sistem koordinat bumi. Berdasarkan data tersebut, wujudkan matriks dan pindahkan ke dalam bentuk persamaan serentak untuk mendapatkan koordinat titik A di bumi. Table B2 /Jadual B2 Point Arbitrary Coordinate (mm) Kordinat Sembarangan (mm) Ground Coordinate (m) Kordinat Bumi (m) x y East North A 532.06 21.35?? B 255.10-531.93 1201.39 154.05 C - 1204.71 496.27 1578.29 2644.98 7 SULIT

QUESTION 3 SOALAN 3 (a) Orthophotos were originally developed to reduce costs and to speed up topographic mapping in areas where full ground surveys had not been completed. Define orthophoto. Orthophoto pada asalnya dibangunkan untuk mengurangkan kos dan mempercepatkan pemetaan topografi di kawasan yang masih belum siap diukur. Beri definisi ortofoto. [5 markah] (b) In rectification, anharmonic theory is used. With an appropriate diagram explain what is the Theory Of Anharmonic. Di dalam rektifikasi biasanya menggunakan, teori anharmonic. Dengan menggunakan gambarajah yang sesuai, terangkan apakah yang dimaksudkan dengan Teori Anharmonic (c) Aerial triangulation is the process of determining the X, Y and Z ground coordinates of individual points based on photo coordinate measurements. Describe FOUR (4) advantages of aerial triangulation between field works survey. Penyegitigaan udara adalah satu proses penentuan kordinat X, Y dan Z diatas permukaan bumi berdasarkan kepada pengukuran yang dilakukan diatas gambar foto. Terangkan EMPAT (4) kelebihan penyegitigaan udara berbanding kerja ukur dilapangan. 8 SULIT

QUESTION 4 SOALAN 4 (a) Digital photogrammetry is the art of using computers to obtain the measurements of objects in a photograph. List FIVE (5) components of digital photogrammetry. Fotogrametri digital adalah seni menggunakan komputer untuk mendapatkan ukuran objek didalam gambar. Senaraikan LIMA (5) komponen fotogrametri berdigit. [5 marks] [5 markah] (b) Closed range photogrammetry is an important branch of the science of photogrammetry deals with photographs taken with cameras located on the surface of the earth. Briefly describe the usage of closed range photogrammetry in :- Fotogrametri jarak dekat merupakan salah satu cabang penting dalam sains fotogrametri. Ia dilakukan dengan mengambil gambar menggunakan kamera yang diletakkan diatas permukaan bumi. Terangkan secara ringkas kegunaan fotogrametri jarak dekat dalam :- (i) Engineering application (Aplikasi kejuruteraan) (ii) Biomedical application (Aplikasi biomedic) (iii) Industrial application (Aplikasi perindustrian.) [ 10 marks ] [ 10 markah ] (c) Digital Photogrammetry uses digital camera system which incorporates a variety of chargecouple device (CCD). Explain the CCD. Fotogrametri Digital menggunakan sistem kamera digital yang menggabungkan pelbagai Charge Couple Device (CCD). Terangkan tentang CCD. SOALAN TAMAT 9 SULIT