評(píng)論
打印
But we don't keep all this information confidential.
但我們不會(huì)對(duì)這些信息保密。
We then need to publish our findings so that other people can access it and be informed by it.
然后，我們需要公布我們的發(fā)現(xiàn)，以便其他人可以訪問它并從中獲得信息。
And one way in which this information can be published is in the form of maps.
發(fā)布這些信息的一種方式是以地圖的形式。
You'll all have used one at some stage of your life already.
你們?cè)谌松哪硞€(gè)階段都已經(jīng)用過了。
Let's consider the benefits of maps from a geographer's perspective.
現(xiàn)在讓我們從地理學(xué)家的角度來(lái)考慮地圖的好處。
Maps can be folded and put in a pocket and can provide a great store of reference when they're collected into an atlas.
地圖可以折疊起來(lái)放在口袋里，當(dāng)它們匯編成一本地圖冊(cè)時(shí)，可以提供大量的參考資料。
They can depict the physical features of the entire planet if necessary, or, just a small part of it in much greater detail.
如果有必要，它們可以描繪出整個(gè)星球的物理特征，或者，只是一小部分的細(xì)節(jié)。
But there is a drawback. You can't exactly replicate something that is three-dimensional, like our planet, on a flat piece of paper,
但有一個(gè)缺點(diǎn)。你不可能在一張平面的紙上精確地復(fù)制三維的東西，比如我們的星球，
because paper has only two dimensions, and that means there'll always be a certain degree of distortion on a map. It can't be avoided.
因?yàn)榧堉挥卸S，這意味著地圖上總是會(huì)有一定程度的扭曲。這是無(wú)法避免的。
We can also use aerial photographs... pictures taken by cameras at high altitude above the earth.
我們也可以使用航拍照片...這些照片是由相機(jī)在地球上空的高海拔處拍攝的。
These are great for showing all kinds of geographical features that are not easy to see from the ground.
這些對(duì)展示不容易從地面上看到的各種地理特征來(lái)說(shuō)很有幫助。
You can easily illustrate areas of diseased trees or how much traffic is on the roads at a given time or information about deep sea beds, for example.
例如，你們可以很容易地闡明患病樹木的區(qū)域，或者在給定時(shí)間內(nèi)道路上的交通流量或有關(guān)深海海床的信息。
Then there are Landsats. These are satellites that circle the earth and transmit visual information to computers at receiving stations.
然后是陸地衛(wèi)星。這些衛(wèi)星環(huán)繞地球運(yùn)行，向接收站的計(jì)算機(jī)傳輸視覺信息。
They circle the earth several times a day and can provide a mass of information -- you'll all be familiar with the information they give us about the weather, for example.
它們每天會(huì)繞地球幾圈，可以提供大量的信息--比如，你們都很熟悉的、它們提供給我們的天氣信息。
So, what we're going to do now is look at a short presentation in which you'll see all these tools...
所以，我們現(xiàn)在要做的是看一個(gè)簡(jiǎn)短的演示，你會(huì)看到所有這些工具...
