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Chapter 438 No, Mr. Zhao, this can also be calculated

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    Soon, the works of Ding Feng and others were carried up.

    It was indeed carried up. It was two meters long and one meter wide. After it was placed in the field, countless people looked at it curiously. As the curtain opened, they saw that it was a map!

    ¡°What a big map!¡±

    "Huh? No, why is this map a little different?"

    The scholars around were all curious.

    Fang Xuanling was also full of curiosity. He walked up and looked at the map in front of him, his eyes widened. This was a map of Chang'an in front of him, but this map of Chang'an was very detailed!

    Nearly the entire city of Chang'an is included, and the towns on the edge of Chang'an City, as well as Zhao Manor and University Town, are also included.

    If you look carefully, you can see that there is an outline of Chang'an City on the map, and then the outline is mainly road lines, and then a few strokes outline the palace and other places. There are also some shop names on each street, but these are all  Very tiny.

    There are also East Market and West Market, which seem clear at a glance, but they seem to be very simple.

    "Lao Fang, how about this map?"

    Zhao Chen had a smile on his face.

    ¡°It¡¯s very detailed yet concise, with the key points marked out.¡±

    Fang Xuanling nodded. The map is mainly composed of roads, and then the shops are replaced by dots, and then small characters are written.

    Zhao Chen pointed at the map of Chang'an with the folding fan in his hand: "That's not the most important thing, Ding Feng, how long is the total distance from the west gate to Zhuque Street?"

    Fang Xuanling looked at Zhao Chen in shock: "No, Mr. Zhao, can this be calculated?"

    "Why not? I can calculate it with this map."

    Zhao Chen smiled slightly.

    Ding Feng and the others took a ruler, measured on the map, then calculated, and said directly: "Sir, from Ximen to Zhuque Street, the total is 2,500 meters."

    The scholars next to me were all dumbfounded. Can we figure this out just by looking at the map?

    Fang Xuanling also felt as if he had seen a ghost. Zhao Chen smiled and said: "Old Fang, what is different about this map is that it is drawn according to a scale. To put it simply, if this map is enlarged two hundred times,  , then it is the complete Chang'an City!"

    ¡°So, this is what I¡¯m talking about, the first element of modern maps, the mathematical element, and the most important thing is scale.¡±

    Fang Xuanling suddenly reacted: "Then, as you say, Mr. Zhao, all future maps can calculate distances?"

    "Yes, as long as you follow standard map mapping and draw with a scale, you can basically calculate the distance. Will this kind of map be very helpful for domestic travel or military marches in the future?"

    "Big, big!"

    Fang Xuanling became a little excited, especially in the military field. He could figure out this kind of map.

    Zhao Chen nodded and said to Ding Feng and others: "Although this map of Chang'an has flaws, it is not a big problem. You have passed the test on the city map. Where is the big map work? Bring it up and take a look."

    The geography students at the back immediately took out another piece of work.

    The surrounding scholars came closer and saw that in this work, Chang'an suddenly turned into a dot. There were mountains and rivers on the map, but these mountains and rivers were all lines, some of them were convex, some were concave, and  The cities near Chang'an have all become a point, but the roads between these cities are outlined.

    "This is¡­¡­"

    Fang Xuanling was a little confused: "The map before you died of exhaustion?"

    "Laofang, these lines can be regarded as contour lines. Look here, the lines here represent hillsides, and the lines here are cliffs. This is a professional map. Only after study can you understand it, so this  Even if the planted map falls into the hands of the enemy, there is no need to worry."

    Zhao Chen held the folding fan in his hand again: "Moreover, this map mainly marks the general situation of Gyeonggi Province. After reading the map, do you understand the situation of Gyeonggi Province at a glance? Where are the mountains and where are the cities?  It needs to be clear where to go?¡±

    Fang Xuanling looked at the map: "It is indeed very clear, clearer than before, but I feel that there is not much difference in the drawing methods. Why is this?"

    Zhao Chen smiled slightly: "It's very simple, because all geography students draw maps based on the north method, using Chang'an as the reference point."

    Zhao Chen took out something in his hand. As soon as he opened it, he saw a pointer pointing in one direction, and then it remained motionless.

    "What is this?"

      "Compass, you can understand it as the advanced version of Sinan. Students of geographical surveying and mapping, take this with you and go to various places to draw maps. You will always have a good idea and know your respective directions, and then use Chang'an as a reference point. Naturally  , they can draw a rough map, and then use the distance estimation method I taught them. It does not need to be very detailed, and the error can even be within ten kilometers. In this way, it will be much more convenient to make a rough map first.  people."

    Fang Xuanling was filled with admiration: "Mr. Zhao, you have put a lot of effort into training students in this major. This major is very difficult for others to learn."

    Zhao Chen smiled and looked at Ding Feng and the others: "Okay, you first batch of geography majors, get ready to graduate. The graduation ceremony begins tomorrow, which is also the prelude to your journey to various places."

    Zhao Chen paused for a moment: "Tomorrow, I will call His Majesty to read your graduation speech."

    Ding Feng and others shouted: "I am willing to go through fire and water for the Tang Dynasty."

    Zhao Chen patted Ding Feng on the shoulder: "You guys pack up today and go see your family after tomorrow. We will basically set off in five days."

    "yes."

    Soon, the geography students dispersed, and Zhao Chen waved the folding fan lightly in his hand.

    Fang Xuanling also watched the group of geography students leave and couldn't help but said: "Mr. Zhao, is the college campus on the right track?"

    "Come on, in addition to His Majesty and me as the two honorary principals, the school affairs office has been established. Annual admissions and evaluation standards for each major have been established. I am almost the same in terms of professional books and professional teaching.  It has trained a group of teachers.¡±

    Zhao Chen sighed: "Of course, if Ding Feng and the others can come back, they can also stay at the school to teach."

    "Okay, Lao Fang, let's go back and have a drink. I overworked last night and need to make up for it."

    Fang Xuanling was a little stunned: "Overworked? Mr. Zhao, you don't look like this kind of person. Don't you just go to bed at night?"

    "Lao Fang, you know what to do, night is the time when you overwork yourself."

    ¡­¡­

    The World Expo in Datang gradually came to an end.

    The main purpose of this World Expo has been achieved. Anyway, it is to use trade routes as a pioneer.

    Of course, even though Alyssa had this accident, Zhao Chen didn¡¯t take it seriously. It was just a one-night fling. Isn¡¯t this normal?

    Then there were the students majoring in geography, after Li Shimin¡¯s graduation ceremony, they also rowed together with the caravan prepared by the imperial court and prepared to set off directly.  (Remember the website address: www.hlnovel.com
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