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单选题 An important element of the scan-line algorithm is that of finding intersections between ( )
学科：2024秋--GIS专业英语
时间：2024-10-12 11:03:29
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题目1单选题
The objective of raster to vector processors operating on scanned maps is typically to produce ( ) in the maps and to attach identifiers to themA. rasterised versions of linesB. vectorised versions of linesC. geographical information
题目2单选题
If the images are to be used for recognizing discrete objects, particularly human-made phenomena such as roads, buildings or field boundaries, it may be necessary to convert to ( ) to assist in the interpretation processA. a raster data structureB. a vector data structureC. either a vector data structure or a vector one
题目3单选题
The task of vector to raster conversion is one of finding ( ) in the raster space which coincide with the location of a point, line, curve or polygon in its vector representationA. a set of dataB. a set of pixelsC. a set of coordinate pairs
题目4单选题
is more difficult to implement since it requires calculating the area of intersection between the pixel and the vector representation of the polygonA. The central point rasterising techniqueB. The dominant unit rasterising techniqueC. The scan line coherence
题目5单选题
An important element of the scan-line algorithm is that of finding intersections between ( )A. edges and scan-linesB. points and scan-linesC. edges and areas
题目6单选题
阅读段落,选择正确答案 Most people consider the landscape to be unchanging, but Earth is a dynamic body, and its surface is continually altering-slowly on the human time scale, but relatively rapidly when compared to the great age of Earth (about 4,500 billion years). There are two principal influences that shape the terrain: constructive processes such as uplift, which create new landscape features, and destructive forces such as erosion, which gradually wear away exposed landforms. Which of the following statements is true of changes in Earth's landscapeA. They occur more often by uplift than by erosionB. They occur only at special timesC. They occur quickly in geological termsD. They occur less frequently now than they once did
题目7单选题
阅读段落,选择正确答案 Most people consider the landscape to be unchanging, but Earth is a dynamic body, and its surface is continually altering-slowly on the human time scale, but relatively rapidly when compared to the great age of Earth (about 4,500 billion years). There are two principal influences that shape the terrain: constructive processes such as uplift, which create new landscape features, and destructive forces such as erosion, The word relatively in the passage is closest in meaning to________A. UnusuallyB. OccasionallyC. ComparativelyD. Naturally
题目8单选题
阅读段落,选择正确答案 Hills and mountains are often regarded as the epitome of permanence, successfully resisting the destructive forces of nature, but in fact they tend to be relatively short-lived in geological terms. As a general rule, the higher a mountain is, the more recently it was formed; for example, the high mountains of the Himalayas are only about 50 million years old. Lower mountains tend to be older, and are often the eroded relics of much higher mountain chains. About 400 million years ago, when the present-day continents of North America and Europe were joined, the Caledonian mountain chain was the same size as the modern Himalayas. Today, however, the relics of the Caledonian orogeny (mountain-building period) exist as the comparatively low mountains of Greenland, the northern Appalachians in the United States, the Scottish Highlands, and the Norwegian coastal plateau. Which of the following can be inferred from the paragraph about the mountains of the HimalayasA. Their current height is not an indication of their ageB. At present, they are much higher than the mountains of the Caledonian rangeC. They were a uniform height about 400 million years agoD. They are not as high as the Caledonian mountains were 400 million years ago
题目9单选题
阅读段落,选择正确答案 Hills and mountains are often regarded as the epitome of permanence, successfully resisting the destructive forces of nature, but in fact they tend to be relatively short-lived in geological terms. As a general rule, the higher a mountain is, the more recently it was formed; for example, the high mountains of the Himalayas are only about 50 million years old. Lower mountains tend to be older, and are often the eroded relics of much higher mountain chains. About 400 million years ago, when the present-day continents of North America and Europe were joined, the Caledonian mountain chain was the same size as the modern Himalayas. Today, however, the relics of the Caledonian orogeny (mountain-building period) exist as the comparatively low mountains of Greenland, the northern Appalachians in the United States, the Scottish Highlands, and the Norwegian coastal plateau. The word relics in the passage IS closest in meaning to_______A. ResemblancesB. RegionsC. RemainsD. Restorations
题目10单选题
阅读段落,选择正确答案 The Earth's crust is thought to be divided into huge, movable segments, called plates, which float on a soft plastic layer of rock. Some mountains were formed as a result of these plates crashing into each other and forcing up the rock at the plate margins. In this process, sedimentary rocks that originally formed on the seabed may be folded upwards to altitudes of more than 26,000 feet. Other mountains may be raised by earthquakes, which fracture the Earth's crust and can displace enough rock to produce block mountains. A third type of mountain may be formed as a result of volcanic activity which occurs in regions of active fold mountain belts, such as in the Cascade Range of western North America. The Cascades are made up of lavas and volcanic materials. Many of the peaks are extinct volcanoes. According to the paragraph, one cause of mountain formation is the______A. effect of climatic change on sea levelB. slowing down of volcanic activityC. force of Earth's crustal plates hitting each otherD. replacement of sedimentary rock with volcanic rock
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